Apartment full of cigarette smoke, which completely ruined the experience for us. If we had had money to spare, we would have moved to a hotel. We always choose non-smoking places because we hate the smell, and we were travelling with a baby. Pia knew about it, since we had asked to inquire about the possibility of having a baby crib (there wasn't) and we feel she should have told us about the cigarette smoke that was very strong as soon as we entered the apartment. We thought the previous guests might have smoked, so we opened all the windows for about two hours (despite the cold). The smell did go away, but we realized that it came back, and it came from the bathroom, which is in the centre of the apartment, and from the there the smoke invaded us for three very unhealthy days and nights. On the floor of the bathroom there is a ventilation hole, and the smoke entered from there, probably from the apartment below. We had to keep the bathroom closed at all times and covered the ventilation hole as best we could, but still, we had to hold our breaths when going to the bathroom, as if someone was smoking heavily right there. We wrote to Pia as soon as we entered the apartment to tell her about the smoke, but no reply. Everything smelled: the curtains, the sofa, the towels... while the apartment was freshly cleaned, the smell gave the impression of dirtiness, and we did not feel comfortable at all using the sheets, towels, bathroom.
Other negative things: 1) the kitchen is not so well equipped (few cutlery, no microwave), 2) the shower curtain is a real mess, impossible to take a shower with the curtain so close to your body! 3) no heavy curtain in the bedroom, so the light bothers you to sleep at night, 4) the towels provided were stained.
Finally: the building and the hallway are filthy and do not give the impression of a safe place. This is apartment 9 in what appears to be some kind of improvised (illegal?) hotel.
the metro Birkenstrasse is conveniently located very close to the building, but travelers must know that this station is not equipped with elevators or electric stairs, so it is not easy with heavy luggage or a baby stroller. Plus it is not on a convenient line. You have to change to get to any tourist attraction.
All this being said, the rest is as in the photos and description: modern, clean. The bedroom is quiet (overlooks a small rear garden of the building). Supermarket close by.
If you don't mind the smoke I suppose it is ok, but definitely not for us.