Thanks to Ture's description I found the location easily. I didn't quite understand the system with the numbers to open the building's door. But that may have been my fault. Thankfully Ture was at home and opened the door for me! From then on I only heard the other family members, because I spent only the night. Everything was spotless clean and I slept very well ;-)
I very much liked the neighborhood and found a nice cafe´ just round the corner. The metro station is a very short walk away, and it is also a nice walk into town center (if not burdened with too much luggage).