We enjoyed a five night stay in late July.
The location is lovely. Cobble Hill has become one of the most desirable suburbs in Brooklyn, and it is a fine place: beautiful brownstones everywhere, good cafes and shops, quite friendly. For transport, you can either walk to the pier and get the South Brooklyn ferry to Wall Street - the most pleasant way to get to Manhattan - or there are various subway options nearby.
The apartment is a pleasant and well-maintained basement with a garden at the back with artificial grass (meaning it's not put out of action if it rains). It's a good set up for kids, with bunk beds in one room. Kitchen, bathroom, utility room all in good working order. The air conditioning in the bedroom is a bit loud, that's my only gripe.
Liat was away during our trip but was responsive and friendly throughout. This was a good place and I would stay here again.