First of all, I would say I have spent one nigth in almost 5-Star Hotel at Petra's Apartment, very tidy, schick, fully equiped. Second, Petra is a very very nice Person, had a very nice talk to her and helped me in everything I wanted. Third, the Apartment is very Close the S-Bahn Station (Beusselstr) so that it is very good reacable with the public Transportation. Conclusion: Very higly recommended to book your next room at Petra's Apartment. @Petra: Best wishes for your PhD