We stayed at Renate's place for three nights and her place felt like home in the evenings after our sightseeing trips. It's located very close to the next metro station (about a three minute walk) and you need about 15 to 20 minutes by metro to get to the city center. We didn't get to meet Renate personally as we arrived late at night, but she arranged everything perfectly and was always available by phone.
The apartment is fully equipped and situated in a quiet neighborhood.