I stayed in Marianne's apartment for four months and it was as good as I expected! The apartment is in a great location, next to a U3 station, which is very convenient since it is the main metro line. Moreover, everything is a 2 min walk (pharmacy, supermarkets and house supplies shops). It is very cozy, nicely decorated and very warm (I stayed there during the winter and rarely needed to turn the heating on!). Since it is on the 3rd floor it is also very bright, even when it is cloudy outside. Overall, it is an ideal place for 1-2 tenants!
Concerning Marianne, she is the perfect host, always willing to help and solve any problems in no time. She was really helpful with bureaucratic procedures even before I arrived in the country and even got a new stove installed as soon as possible when I realized there was a problem with the one in the apartment. She is also a quick-responder and willing to help me with whatever I needed, given it was the first time I ever lived alone. In general, I would totally recommend her as a host!