1-Zimmer in Neukölln gegen 1,5 oder 2 Zimmer

My 1-room flat is located in Neukölln on Nogatstr., 1 minute away from U Hermannstrasse (U8) and the S-Bahn. The Tempelhofer Feld is only 8 minutes away by foot, as well as the very nice Schillerkiez. The beautiful Körnerpark is also very close. So there's plenty of options in the area! The flat itself is located on the 2nd floor of an Alt Bau (Seitenflügel) and faces the hinterhof. It includes a spacious living/sleeping room, a kitchen (semi separated from the living room) and a bathroom with a bathtub. The flat has high ceilings and authentic wooden floor in the living room. It is perfect for a single person. The current rent (warm) is 665 €. I am looking for a 1,5 or 2-room flat, I'm flexible regarding the location but ideally not too far from the ring Bahn.