We had a really good time at Etienne's place. It was clean and comfortable and last but not least it was really stylish. Judit was super nice, check-in and out was super easy. She gave us really good tips and they have a pretty amazing list about cool places around Berlin. The studio is around 20 mins from Alexanderplatz and there is tram M5/M6/M8 and M10 nearby (they are go to the city centre and to cool places).
I really recommend this studio/apt. to everyone who is planning to visit Berlin.