It's a brand new apartment, clean e comfortable, the space is very nice for 2 and the kitchen has the basic stuffs for coking. The locations is very good because there is a tram stop in front of the house, a supermarket and restaurants few minutes walking.
As the most old buildings in some cities of Europe there is no lift, so you need to be able to carry your luggage until the 3rd floor
We stayed there for 5 nights in the summer and was pretty hot, so we had some problems to sleep because we couldn't open the window because a lot of flies came through.
If you want to visit Prague, I really recommend this place