As others have written, it's a really small place, but it's ok for a single traveler staying a few days and in a good shape (there are a lot of stairs to climb). The location is simply amazing; the area is full of life without being chaotic, close to the main line of the metro and surrounded by exceptional Art Nouveau buildings. The furniture isn't luxurious, but the bed is comfortable and I cannot really complain, especially considering the price!
A couple of very easy things would make the stay better, like offering the option of using a curtain on the window and checking the fridge (it makes loud and strange noises). The apartment is reasonably clean and the wi-fi connection is fast (with some short hiccups).