Marie is a great host: Flexible, friendly and answers promptly. However, the walls in this building are quite thin, so you can hear most of what happens in the hallway, in the street and above you. This was only a problem during nighttime (we stayed there during a weekend, and several of the apartments hosted parties that made sleeping difficult). But staying in Nørrebro overall was a positive experience: The area has a lot of unique bars, restaurants and stores that you won't find anywhere else.