Overall a great stay, with very professional staff and very good location. They were easy to contact, quite helpful and solution-oriented when we had problems.
It's a block away from the metro, and lots of different trams, so you'll be able to get anywhere in Prague quite easily. Lots of bars and restaurants around too, including some of the best breakfast I've ever had in the city.
The rooms are small but clean, accurate to their pictures and descriptions.
One important warning: their standard room has a huge door connecting to the neighbor's room, so you can literally hear each other the entire time. The rooms are very small so this was quite unpleasant. I would not recommend that room specifically, but rather the next tier—which was quiet, a little bigger and definitely worth the money.