The studio has a great location, near the metro (few mins walk) with lots of shops, food, coffee places etc nearby.
The building the studio is in is not residential and there was lots of noise at night from the club downstairs the week we stayed with people leaving at 2/3am, we were out most of the day and night so couldn't comment on daytime noise.
The size was fine for a couple the studio was warm and cozy, the bed was very comfy, the bathroom is very small (and without a latch/lock) but ok for a few days. The studio also has a little kitchen and fridge we used mainly to store drinks and snacks!
The studio is great value if you are looking for a simple, clean and cozy base to explore Berlin from!