We had a great stay here and will definitely book again if we return to Berlin! The place was easy to find, matched the description, and the check-in instructions were very clear. We were pleasantly surprised that the place was warm when we got there - which was amazing because it was wintery cold (-3°C) outside when we checked in.
The place is very spacious and the double bed super comfortable (not too hard, not too soft - I believe it has a medium to tough matress with a softer foam layer at the top which is just beautiful to sleep on). Since this is a ground-floor studio, I would imagine that it does not get too hot in the summer but when we were there in the winter it was nice and cozy from the powerful heaters.
The area is very convenient: the Südkreuz train station is only a 10 min walk away, and there are a lot of nice cafés in walking distance (5-10 min) that all serve a delicious breakfast (highly recommend the Mokalola, Unser Café and Papalacup).