The hotel was dirt cheap and I had no great expectations.However I find it quite nice.The girls in the reception were sympathetic.Breakfast was OK.The trains didn't bother me although they drove by just outside the window. Typically East-Berlin neighborhood but not bad at all.

Pluses: I stayed at Georghof hostel, nearby Georghof hotel, because there wasn't free rooms at hotel. It is old-fashioned, but cozy. Room was not big, but there were enough space for big luggage, putting and hanging other stuff or clothes. There wasn't sink in the room, but clean and warm dush and wc room was only few steps from the room. There were 2 clean towels and small shampoo. The U and S-bahn station Frankfurter Allee is only 5 minutes away, it is near big shopping center Ring.
You must pay 15 euros deposite for the key, but it is returned without problems during check-out. You must not leave the key at reception - very good. There is a lift, very convinient. Stuff is very kind and helpful.

Minuses: the photos of hostel, published online, in reality are taken in hotel. No internet acsess in hostel, despite it is written it is. Very noisy outside, because S-bahn line goes only few metres from hostel.

12 trains an hour, day and night so i cannot recommend this hotel at all

The hotel was really nice!
I had read the reviews here and to be frank I expected worse.

Concerning the noisy S-bahn, I'd like to say that we were put on the 2nd floor (that is in the same height as the S-bahn train), but our room was in the front side of the building, and so the noise was negligible. My guess is that rooms in the back of the building have some more amount of noise because the S-bahn line is behind the hotel. But my experience in a few words: no problem with the S-bahn.

The rooms were very clean, and not small at all!
The breakfast was very nice.

Disadvantages for me:
a) I'd prefer the room was a little bit more warm (wasn't cold but I come from a warmer country),
b) The flow of water in the shower was a bit low.
c) While the bed was double like we ordered, the mattress wasn't one double, but 2 singles!!!

I stayed 5 nights at the hotel in room 209 and I got to say that it is excellent value for money.