The best part of Vincent's place is by far the location. It's within walking distance of the train station and almost every sight you'd want to see as a tourist, and if you want to go off the beaten path, it's also close to public transit which can get you anywhere. We really appreciated the guest book full of great recommendations from previous guests on places to visit and eat. The flat itself is not luxurious, but we weren't expecting luxury, and it's certainly comfortable enough for a few nights. The kitchen and bathrooms are clean.
We had two minor complaints about our stay: first, the walls are very thin. The person in the next room was having a loud skype conversation in the middle of the night, but she did quiet down when we asked politely, so if you stay here, keep in mind that other guests can probably hear you. Second, the beds are really creaky. They're comfortable enough, but they creak every time you roll over, which made it hard for me to share a bed because I felt like I couldn't move for fear of waking my partner. This probably isn't an issue for most people! Overall, we had a very pleasant stay and would consider this flat the next time we're in Prague.