My stay was excellent. The apartment is very nicely located (all the major attractions are within walking distance) with a lot of shops, bars en restaurants in the immediate area. Because the apartment is located in a courtyard, you don't hear any street or city noises. At night, the doors to the courtyard will be locked, but you can open them with the set of keys Vadim will give you.
The kitchen and bathroom are nothing fancy, but they were clean and the shower had a good water pressure and temperature. Nothing to complain in that area.
Vadim was an excellent help: he gave a lot of tips and he always responded to our messages.
If you are interested in exploring Prague, I recommend this apartment.