We had a great stay at Rosy's.
Her place is very clean, confy and nicely decorated (even prettier than the pictures). Rosy has been really nice to us, and very welcoming, though we checked in very late.
A lot of little details made us feel at home.
As stated in the listing, there is a train nearby so it's quite noisy, but earplugs are provided.
The flat is located in a Brooklyn area which have not been yet "hipsterised" ... we had absolutely no problem and neighbours were friendly, yet it's not Williamsburg.