The host, Peter, was very helpful, he gave us good tips about what to do, where to eat, how much the transportation tickets cost, how to get around the city and so on. He also was flexible with the check out time.
The apartment was very clean and had everything that you might need: extra pillows, extra blankets, we even found honey to put in our tea and a lot of other stuff.
The location was also very good, 2 minutes from Westbanhof station, you have good train connections, shops, supermarket, all very close to the apartment.
The only problem was the building's elevator, if i can call it an elevator. It's a one person...something...but not an elevator. We didn't mind taking the steps three floors anyway.