Pros:
- very good location, U bahn very close
- Sylvester was communicative and reachable
- Kitchen fully equipped,even with spices! :)
- Good neighborhood

Cons:
- walls paper thin,I could even hear my flatmate breathing sometimes
- no washing machine
- internet very bad
- no real door for bathroom,only some kind of cover,so minimal privacy there

Overall, if you are coming for a few days or a week then this is a very good place to stay, especially if you are with friends or don't mind living with 2-3 other people. I was living here for two months, and had to get used to some small inconveniences like a weird shower, but it wasn't a big deal.
Sylvester was helpful mostly and really didn't bother us with anything.
The room was nice, but between my room and the next bedroom was not a complete wall,half of it was just a wardrobe separating the two rooms,so there was no sound isolation at all, and it was pretty disturbing sometimes.