The four of us spent three nights in Amit's flat to explore Berlin from there. The flat is very central near the metro and a supermarket and drugstore are within walking distance. Despite the busy street, it is quiet in the flat (when we stayed there). Upon arrival, everything was clean and tidy. The check-in went smoothly and quickly and the communication with Amit was perfect. He is quick to respond and helpful.
The beds are fine (including the sofa bed our children slept on).
We recommend the apartment for a few days if you want to visit the city.