In short: it's simply an amazing place to stay for a reasonable price!
It's placed the way you can easily reach any sights in any direction. The main sights are just around the corner literally. If you want to reach Vysehrad on the south or Jewish Quarter on the north or Prague Castle on the left side it's maximum 25-30 minutes walk. The nearest subway station is about 8-10 min by walk, so you can easily go anywhere :)
The surrounding is 5/5. It's a calm place around, the windows face the quiet yard, so you never be bothered by car traffic or tram rumbling. The apartment itself is located on the fourth floor.
There are plenty of places around with food, and bars of course. Grocery stores (Tesco, Billa, Albert) are also in few minutes walking.
Interior is exactly as on the pictures, very spacious, bright, well furnished and equipped. There are every household things that you need, like towels, shower accessories etc.
And of course Matej. Very polite and easy to communicate person!
We definitely recommend this place to stay in Prague!