My sister and I came through for three nights. Arno was very easy to get ahold of and had instructions for everything. Getting and leaving keys is very easy which makes check-in and check-out simple and at your leisure. Our favorite thing about the space is the courtyard and windows opening up to said courtyard. Also, there is a lot of space! We did find it odd that there aren't pillows provided for the beds (other than throw pillows) so if you're a pillow person- bring your own. Overall we had a wonderful stay and the apartment is very well kept. Its in a great neighborhood too and easy to get anywhere in Berlin. Arno is great! Thank you, Arno!