Fatih and Sibel couldn't have been more helplful or nicer people. They work very hard (too hard!) and so weren't around much; the upside is that I had the whole place to myself most of the time. The apartment is bright, quiet and spotlessly clean; the en-suite room is large with plenty of wardrobe etc space. Absolutely lovely, with a living-room balcony overlooking the Thames (and a somewhat buzzy power plant which didn't bother me much). Greenwich is only 10 minutes walk away with markets and shops. The transport links were okay (frequent buses to nearest overground station).
I would definitely stay there again. 10 out of 10.