I read some discoussions around and everyone was talking good about trezor.
Im newb and i need some advices/opinions from persons wich know more than me about wallet.
1. Where are my coins stored if i use trezor?
Your private keys are kept within Trezor. As long as no one has the ability to crack the firmware and make it leak your private keys without your authorization pin, you are fine.
2. Do i lose my coins if i lose trezor device or it fails/burns?
No. Trezor generates a seed everytime a user creates a wallet. The addresses are generated from that seed. As long as you have your seeds, you are covered.
3. Is trezor 100% safe and the best way to keep coins?
If you can review the source code of Trezor and make sure you install the version you reviewed and compile yourself, you are 99%* safe.
*If they didn't use a backdoor on their hardware.
I saw many discussions on here talking also for offline wallets..papper wallets or cloud ones.
Wich one is the best ?
Cloud wallets will never be safe. Offline wallet and paper wallets would be the safest if you spend them correctly.