This place is great! The location is fantastic, just a half block from a tram/bus stop. We had 8 people and used the blue and red flats together.
There are some stairs, so be warned if you have mobility issues, but there is an elevator to get you and your luggage up to the fifth floor.
There is a bakery just up the block, plus Adam and Stepan left us some snacks and lots of information about Prague. We loved it!!