I have stayed at Angelika's place for three weeks during my holiday trip to Berlin in January 2017. I unreservedly recommend Angelika as a host and her beautiful and centrally located apartment.
The location is ideal: as i like to explore cities by foot it is walking distance to many local attractions. Kudam, the main shopping street, is just next door. On a sunny weekend it is nice to walk to the 17 Juni strasse flea market and then have a country style branch or dinner in Cafe am See in Tier Garten, which is just across the road. Sybelstrasse itself is a quiet residential street tucked away from noise and bustle of Kudam and has lots to offer: grocery stores, cafeterias, bakeries and pubs. From Kudam one can easily get to any other part of Berlin as bus and undergoynd connection is excellent.
The apartment is great: very clean, cosy, modern and fully equipped. Angelika is a very hospitable and caring host: none of your questions or requests will be left without her attention. I thoroughly enjoyed my visit to Berlin and staying in this apartment has only made it more enjoyable.