The house is lovely silent and safe (besides the fact there is elevator available on the building). The bed is confortable and the shower is very good. Wolfgang is helpful and corteous. The Subway is just crossing the street and about 4 or 5 stations To the downtown.
The only sugestion I Can give To the guests is To record the surname of the hostess because You will need it To identify the right floor and apartment in the building (in my country each apartment has a number and there is no surnames listed, maybe that's the case in your country as well)