We spend 3 night at Ondřej's apartment. The apartment is in a central area (close to central station and around 15 minutes by foot from tourist main attactions and close to shops and restaurants) and located at the 5th floor with not elevator (but that is not kept secre). Check-in went smooth, Ondřej gave us clear instructions about that.
The apartment itself is okay,the kitchen is very furnished, we didn't, but it is possible to cook. Overall very cleaned, althoufh we found that the blankets were quite old and the carpets don't give the feeling of something that can be cleaned easily. The one in the bathroom especially is not something you want to put your feet on. Last remark is that the shower head is very short, so if you are taller than 1.65 you will have to lean to wash your hair.
Apart from this, Ondřej made sure we entered the apartment and gave us recommendations to visit Prague. Our stay went smoothly, so I would still recommend it.