Igor's apartment is a really nice place to stay if you're planning to spend a week-end or more in Berlin. The apartment itself is really nice and has most of the stuff needed to be independant. The only thing to note is that it's a bit tight to move inside.
The location is perfect if you plan on going to restaurants or bars in Friedrichshain but it's also very quiet.
Igor is answers really quickly to any question and is really helpful.