Laurence and Reginald proved courteous, thoughtful hosts, and we enjoyed our stay.
Cons: A previous comment about noise overhead is true. (On the other hand, the street was unusually quiet at night for Brooklyn, so we were able to sleep well.) Older/less hardy people should also be aware that the few steps down to the flat are steep, and it takes three keyed doors to get into the flat itself.
Pros: Great location; you can walk to all sorts of cool restaurants, shops, bars and parks; and there's a Manhattan subway stop a few blocks away. Very clean, and comfortably heated without overdoing it. Nice art, too.