I've looked after it in the couple of months I've had it. Used to belong to a Harvard student who used it for a month while in town visiting her boyfriend. No idea what make it is - there's no brand name etc - but it's got fifteen gears, two wheels and I'll throw in the bike chain.
Not sure of the frame measurements, but I'm six foot and it's a little small. So probably best suited to someone a few inches shorter. I'm living in Prenzlauer Berg, you can view it before 11am or after 7pm.
Any questions, mail me and I'll respond ASAP. Photo attached.