Put simply, this apartment is great! It's located in Mitte which is near the centre of everything. If it's your first time in Berlin, you will not be disappointed. You are within walking distance of an endless array of cafes/restaurants and shops to cater for a great many tastes and budgets.
Communication with Matthias was prompt. The check-in with Gabi was easy and we loved the personal touch of some chocolate and water. Small gesture, but really appreciated. We arrived and the sun was shining, so the balcony doors were open and really shows the apartment at its best (it was one of the selling points for us).
You are connected by tram, U-Bahn and S-Bahn within a few hundred metres of the apartment, I can't stress how easy it was to get around. It's close to the restaurants, shops and cafes around Auguststraße/Schönhauser Allee, an area we love.
Cleanliness was top notch. Good, clear instructions on the washer and the dishwasher. Super comfy sofa which was a comfy bed too. We were even able to play our music through USB on the stereo. If you like your home comforts, this apartment has them in abundance. We LOVED it! And will be recommending it to anyone we know visiting Berlin!