My flat in Friedrichshain is an interesting option for travellers who want to experience the real alternative Berlin. The closest metro stops are Ostkreuz and Treptow Park (both less than 10 minutes walking). Opposite the river is a Arena area with open pool for summer. Nearby is also Treptower park, quite some clubs like Wilde Renate and Aboutblank.
Unavailable: Smoke detector
Unavailable: Carbon monoxide detector