How cheap could high quality housing be?
Ignoring precedent, what does a person need to be happy?
I don't think ownership is or should be one of these things. Security and peace of mind yes, but do you feel Google is going anywhere soon, so are you happy with being able to use Google search, do you feel there is a gap in your life caused by not owning Google, or the internet it searches? Often competition although you don't own it increases your feeling of security about a service right? It's a vote of confidence as well as being a backup service. Maybe you even want each services to be able to maintain an image of what your doing on each of the others to ensure an even greater level of robustness. Many are still happy not to own all this infrastructure that guarantees such amazing efficiency, it would be such an impossibly impractical thing for them anyway. Whats more if you own everything, in a way you still own nothing, it's like one person having all the BTC.
How about activities that you want, when you want them? I could go one further into being only when you need them, but I don't think this is workable even if it's moral, support groups for addiction are a great idea but it's quite different to not let a person into a casino because they resemble problem gamblers you know.
And believe it or not thats everything, that one point covers socialising, societies for interests, pubs, sightseeing, professional and academic interests, exercise such as sport and so many other things I couldn't possibly list them all.
Back to designing the house, to cover the "Activities on demand." requirement, location is the most important thing, in a densely populated city is a good start. Some outdoor pursuits may not be as compatible, however you could be more likely to find people to go with to do them, so even then you may well be better off in the city. Lets presume you choose the city option.
How large is this house, we need 3 bedrooms incase we start a family or have visitors, a kitchin to prepare food, a bathroom or two, a front or living room and another room as well as houses often have thease. But do we? This is a financial and maintenance overhead on your whole life, it's not just a case of ticking all the boxes because you might as well, there are drawbacks to this, as already established ownership of infrastructure is not the most optimal way to live, only availability is desired. Do you need a washing machine and tumble dryer or clothes line or could you use a laundrette instead, do you need an anvil or could you buy cutlery ready made, do you need a huge farm or could you use a much smaller segment of another persons farm indirectly via a food shop? I've lived in a city with a high enough density of infrastructure and due to my location the laundrette was close enough that it didn't make sense to own a washing machine, this is unfortunatly unusual, but there are pleanty of things you wouldn't think twice about just going out and doing like:
Printing a poster.
Borrowing books.
Meals for special occasions.
Watching a film.
Now we have thined out the space, maintenance and electrical costs of the washing equipment why do we need the space left behind in their absence, you were happy with no having that space before, will you really benefit greatly for it now? So lets lose that space too, causing the house to become smaller, presuming your in the right location or transport infrastructure is extremely progressive you've saved time and money too and you've saved this every few days, but now what do you do with the time and money you've saved, how about:
Joining a new society or interest group.
Getting your body or mind into shape.
Catching up on daytime TV.
Already some people will be suspicious though, we have saved money and increased the quality of a service, however think that it wouldn't be hard to deliberately spend more on a service than is required without the service being any better, so why is an increase in efficiency so unbelievable. You really do get more yeald by having the farmer grow your food over doing it youself, and while the farmer may or may not have good environmental and food quality practices this is not inherent in the centralised approach, this is just that farmers decision.
In this house, extra bedrooms could be useful, but when they are not they only take up space, time and money. If you both don't think you and your own time are worth anything and you vacuum without electricity you could take out the financial costs, but even then the rest is true, so if possible it would be better to get these things on demand right?
Now your house is smaller you only need one bathroom, you probably only needed one anyway.
I'm not going though all the intermediate reasoning for this, but you really shouldn't benefit even financially from cooking at home although in most places you do, lets remove the kitchin. If you find you miss cooking, take up a job or join a society for it.
1 bedroom and a bathroom remaining, the bedroom dosn't need to be large enough for your PC, a TV which somehow ended up with its own separate screen, Bookcase and CD collection because you can replace it with an IPad or Nexus, a Kindle and a Spotify account or other similar service, it does need to be large enough for a bed.
When your not using all the extra infrastructure required to make this work, it shouldn't cost that much for it to tick over, after all others are using it. You can now go out and do things, need to watch video on a huge screen one day, go to the cinema, want to get some excersise or catch up with mates, go do it, your mind is not going to turn to mush if your not enslaved, if it doubt join more societies. Want to try a particular job one day, your feeling some existentialism about your current direction, even this should be possible although maybe not on full pay. Want to move house, it should be easy!