I booked the flat only few days before my journey, but everything went better than great. I met Caro already in Hamburg (and got the key) , because she was coincidentally on the way there, when I did the booking :). Caro's flat was just perfect for me - it was very pretty and felt immediatly like a home. I know Berlin pretty well and the location couldn't be better - Friedrichshain and Kreuzberg are my absolute favourite areas there. Kaiser's (a big supermarket, open mo-sa til 24:00) is only 100(?) meters from the door. Warschauer Strasse is very crowded, but the apartment is very quiet! Caro was everytime easy to reach, if I needed to ask something. Highly recommended :).