Overall, great stay and location. I would stay again and recommend to others.
Pros: location was perfect; near London Bridge Station/ underground, the Shard, and Borough Market. Flat was warm (stayed late November). Host response was speedy, attentive and professional. Place was generally clean, lots of furniture to place items, and great value. The check-in and check-out process (lockbox) was swift and straightforward.
Cons: being in the central location meant it is close to the trains, buzzing night life - so expect some noise (though pros outweigh the cons). There are quite a bit of stairs to walk up and no lift (for those that would impact to bear in mind). The particular room we stayed the bathroom extractor fan was active (so noise again, though only when the light was turned on for the bathroom).
Tips: if heading by underground exit via the Retail area and take the escalator up; it will be directly one brisk walk to the flats. Bring some ear plugs if you are a light sleeper (though host can supply some).