This apartment simply amazing. It's huge (and you can't really understand it from the pictures), with a heritage, but same time you have anything you need. The location is brilliant. It's in the center, but it's like a hidden gem, because it does not face noisy street. You have a private entrance through the garden of the restaurant downstairs, but don't worry it's a very calm place, so you won't be disturbed by any noise. There's a big terrace as well so you van have morning coffee there (and not only :)).
Also, the hospitality was just great. It was 3 of us and we got 3 sets of keys. We also had a very late flight and Ondrej said we can leave our luggage till the time we were leaving.
So if you are going to visit Prague, this place is a right choice!