It is a nice, clean hotel in central western Berlin. Friendly staff. Very close to the train station, which is a plus, or minus if you suffer from noise (mainly external rooms). Windows do not block sounds, so once people sit in the internal garden, you hear everything.
We were there at the end of October, but the weather was very warm (19 C.) and the air conditioning was already set to warm only. One of the main reasons for us choosing the hotel was that it was a bad choice.