We stayed at Elenas apartment for 6 weeks this summer as we moved here and were looking for an apartment while our belongings were on route.
The apartment is in a really great location in Schöneberg, a fun and exciting but still very safe and family friendly neighborhood. U Bahn is right around the corner as are numerous excellent restaurants and little shops. The apartment is a little sparse but really has everything you would need and want in a temporary place. Even though it is on a busy street once you close the windows it is really quiet. Really great for kids as there is an amazing playground basically across the street (Wartburg Platz) and a fun Swimmingpool (indoor and out) around the corner as well.
The two bathrooms are very modern and brand new as is everything else. We were only the second renters but I am sure Elena will put a few more pieces of furniture in it to make it more cozy. No TV but really, who wants to watch TV in Berlin?
WIFI was great!
Also, daily shopping is basically next door (Penny Markt and an Aldi) and the bakery downstairs just opened the morning we left - we were bummed about that :)
We do have to mention the restaurant Chay Village on Eisenacher Strasse right by the U Bahn, best vegetarian Vietnamese food ever! And the Doner is good on the corner as well. We will miss our little hood (Kiez) and will come back for the food and great atmosphere!

Elena was great, responsive and very helpful, we really recommend this place!