The staff were great and helpful, everything was clean and organized. The only thing you need to pay attention is the room size, as the rooms are very small and you need to make sure that you can manage in such a small space.
I stayed for three nights and managed to fit in with my luggage (a big and a small suitcases).
The showers get cleaned after each use, the bathrooms are always cleaned and well-maintained.
The lobby in front of the reception has beers and wines for very reasonable prices.
The metro station (Lines 1 and 7) is right across the street, a minute away only, so that's a big advantage.