We really enjoyed our stay in this flat. We picked it primarily b/c it was close to a flat our friends had rented, but the location turned out to be the best thing about the flat - it's steps away from Borough Market (which was, sadly, closed during our stay b/c of the terrorist incident, but I visited later and it was great) and 1/2 block from the London Bridge tube station, plus Southwark is a really hopping area with lots to do.
Owners' description was clear and honest and set our expectations appropriately. The layout worked well for our family of 4 (2 adults, 2 kids), and even though it was smaller than our friend's flat down the street, it never felt cramped. Showers were nice and hot, appliances worked and the kitchen was well-stocked. Note that there are at least 3 remote controls - we got the TV working, but it was a bit confusing to figure out. Also, it is right on a busy street - which makes it convenient to everything but perhaps not great for light sleepers (note that it didn't bother us).
I was all excited about the little patio, but oddly, we hardly used it (except to hang out laundry to dry - European combo washer/dryers just don't dry - has nothing to do with this place, it's been my experience with all of them). The idea of having our coffee out on the patio was great, however, and I did enjoy it one morning.
I'd definitely rent this flat again, we really enjoyed it!