Great area, a 5 minutes walk brings you to the Southwark metro station. Very close to bars, restaurants, shops, theaters (Young and Old Vic)...
The flat is great, two nice and warm bedrooms, each one with own bathroom (one with shower, the other with a bath, a nice living room and kitchen with everything you need to cook. If I have one negative comment to say, it would be that it is a bit noisy due to the proximity with the railroad, but it is not unacceptable.