Elisa's place was great, clean and spacious, with pretty good connection. There are a few bus stops within a few minutes walking. You'll probably have to change to another bus or metro to get to most sightseeing spots, but the Berlin transport is really good so it's no hassle at all.
We had a really early flight, but Elisa has no problem with letting us leave the bags, which we really appreciated.
We would definitely come back!