The location is to die for. It's in walking distance of all the major landmarks of central Berlin (Brandenberg gate, Reichstag, Dome, Checkpoint Charlie, Mall of Berlin, Berlin concert hall, zoo). There is a subway station literally right outside about 50 meters away from the front door. You are in a dense area so there are plenty of shops for any needs that arise: large grocery store (Rewe), small grocery store (Vietnamese family owned store), a nice VIetnamese restaurant, a nice Pizzeria, Shafer's baker, Starbucks, to name just a few. You are also within walking distance of several large beer halls.
The apartment itself easily caters to 4 adults. The WiFi is super fast, allowing for streaming or video calls. The bedrooms are comfortable, there is good heat for the winter months, the water pressure in the bathroom is excellent, and the kitchen as everything you need (stove, fridge, microwave, coffee maker, plates/dishes/bowls, utensils).