Most flats in London are offered furnished. This would be great if they had decent looking furniture, but most furnished flats (in our experience) seem to have cheap, outdated furniture. Our flat was offered furnished or unfurnished. After seeing the overstuffed, white leather couches they had in the living room, we were quick to ask for it unfurnished (aside from a bed, so we'd have something to sleep on!).
The day we arrived we headed out shopping and eventually found a lovely couch at John Lewis. It folds down to comfortably accommodate two sleeping adults (yes, we laid on it in the store) and makes for a stylish, modern couch when upright.
The fabric is a dark gray made up of small black and gray checks:
The best part of this couch, is that we no longer have to eat our meals on our bed!