Room and rest of apartment (bath rooms and kitchen) were basic, but pretty clean and new.

Apartment is located in the Neukölln area, an upcoming neighbourhood with a lot of döner kebab food stalls, bakeries, groceries (including one that is open 23/7), telecom shops.

Very close to city center: 5 minute walk to U Hermannplatz, which is connected to the U7 and U8 underground lines; only six stops to public transport hub Alexanderplatz. Directly connected to Berlin Hauptbahnhof (main station) by bus line M41 (bus stop: Sonnenallee/Pannierstrasse, 5 minute walk), which runs 24/7.

As the owner was usually away from his apartment (opposite the rented apartment), it was difficult to get in touch with him during our stay.

Some general suggestions:
* If you need mobile internet, buy an ALDI Talk start kit for €12,99 and choose the Internet-Flatrate L plan (€9,99). This will give you 1.5GB (1500MB) of data on the E-Plus network. If data only works in your browser (i.e., HTTP traffic), change the APN to internet.eplus.de (username/password: eplus). The ALDI supermarket is a 10 minute walk, just beyond the Hermannplatz (Hasenheide street).
* The Berlin Welcome Card includes discounts (minimal 25%) for almost all sights/attractions and unlimited public transport for 48h, 72h or 5 consecutive days. Bus lines 100 and 200 (included with Welcome Card) will guide you along all main sights.
* Free things to do: climbing the Reichstag's dome (prior registration required), Sachsenhausen memorial concentration camp, Potsdam park (huge!), Schloss Charlottenburg park, Berlin Wall memorial (Bernauer Strasse), Topography of Terror, Tranenpalast exhibition, climbing the dome of the Deutscher Dom (Gendarmenmarkt), Tempelhofer Park.
* Berlin is very nice to explore by bike. The Fat Tire guided bike tour was a lot of fun.