Me and my cousin stayed in the Citylight Hotel from the 10th until the 15th of August, we were in Berlin for a short summer break, and we both found this hotel to be absolutely brilliant, not too far from the central sights but far enough for it to be quiet and more local. The hotel is 5 mins from Gesundbrunnen U-Bahn and S-Bahn stations which has frequent and fast trains to the center of town, and is underneath the Gesundbrunnen Centre mall which was really nice - lots of good shops like H&M and a shop with DHL facilities for mailing letters home.
The hotel itself is incredibly quiet, I wasn't woken up at night by any noises (except for the wake up call that I ordered, and got dead on time), the rooms are big with enough room to move, have a massive cupboard, large windows which can open slightly or completely depending on the weather, and all are very well designed and modern, and they are cleaned every day with the soaps/shampoos restocked each time along with fresh sheets and towels.
The hotel has a fantastic breakfast spread, lots of meats, breads and salad, along with cereals, teas/coffees and was kept well stocked the whole time, I would have liked more of a hot choice but this is Europe, so it wasn't a problem at all. The games room has two pool tables, a big telly and vending machines for snacks, drinks and cigarettes as well as an indoor smoking room, which was handy because it was raining heavily outside. The bar is very well stocked, and also very cheap so that got used a lot! The staff are absolutely fantastic, really polite and very helpful even with my limited German.
I would absolutely recommend this hotel to anyone, and will almost certainly be coming back next year!