If you're young and haven't inherited a property from your ancestors, chances are that you're forced to rent. Personally, I've been renting for over 6 years and have been living with my girlfriend for the last 4, sharing rent and utilities. Overall, we've both spent over €25,000 together, and after spending all this money, you're practically left with nothing and may be subject to looking for a new house at any moment.
The average rent for a one-bedroom apartment is between €300 and €400 at best; thus, I was thinking that taking a loan is as costly as paying rent per month, but after 15-20 years, you end up with a house. My main concerns are the following: First, if you're in a long-term relationship like myself, you can never be 100% sure that you'll be with that person in 20 or 30 years from now, which might prevent you from opting for a loan. Secondly, you need to be certain that the location or city of the property to be bought is convenient for future job offers and so on. Thirdly, because a loan is a many-year commitment, there's no guarantee that you'll be able to afford the monthly payment 15 years from now.
On top of that, finding the ideal house as a renter is almost impossible; there's a lack of housing, and rents are extremely expensive and unreasonable at the same time. We had a difficult time finding a house recently, and it's far from ideal. There is now a new government-funded loan program that is about to start, funding up to 75% of the loan interest-free while the rest is funded by private banks and is subject to a relatively low interest rate. This led me to think about taking a loan and purchasing an average two-bedroom apartment, but I have the concerns that I voiced earlier.
There are so many different situations you need to find the setup that works for you. Some people get lucky with a flat share with friends at a fraction of the market rate, others get trapped with the worst housemates out of necessity yet still pay high amounts due to the local area, some people who buy a house pay stupid interest rates because they do no research while others are running optimum finances that make a mortgage the best option. It can be hard to find the ideal house as a buyer because your budget is often fixed at the limits of what you can afford, many people start off with buying a flat which comes with the possibility of problems you identified as a renter.