Pros: the location of the apartment is perfect, everything in the city was easily reachable. The room is big and spacious and it even has a desk where you can work. If you are looking for a cheap place in the old town for 2 people, it's a good choice. Vincent and Katherine are great hosts and they provided all the information we need to know about Prague in advance.
Cons: the single bed is really uncomfortable, I would recommend to change that mattress. It can be quite noisy at night if you open the windows to get some fresh air. The common areas are cleaned by the guests so they can easily leave it dirty.