My husband and I stayed here for a month, and Reuben and Jekaterina's place was a perfect home base.
I had to attend conferences and do a lot of work while we were there, and the apartment's layout made it an excellent place to get things done. The internet is fast, the street is quiet and there are tons of great food, coffee and grocery options just steps away for a quick lunch or nice dinner! The washer and dishwasher were lifesavers and the kitchen had everything needed to make meals. There's no TV, but the living room has a place to set up a projector (bring your own! We brought a travel-sized one). I also really loved all the art and the bedroom's calming mountain mural. There's also a cute balcony we used a lot during our stay! (One word of caution-- the place is on the 5th floor with no elevator, so it's something to consider if you have trouble with stairs.)
The neighborhood is great, too. The apartment is just a short walk from the U Bahn, making getting around really easy. It's also just a short walk from Tempelhof Field, an amazing former airport-turned-public-park that is great for a picnic, a morning run, or a spot to stroll. (We were here almost every morning!) You'll find lots to do just within walking distance of the apartment, including the occasional flea or farmer's market.
I would definitely stay here again. The month flew by! Thanks Reuben and Jekaterina!