We loved our time at Greg & Adriane's flat! The flat itself was very clean and cozy. It is located in a very authentic Brooklyn neighborhood with great public transport links and lots of restaurants/bars nearby.
Greg & Adriane were very helpful, and responded very quickly to any queries we had.
The only issue was the noise from the apartment above as the cielings are very thin, you could hear footsteps and kids running around. This wasn't really a problem for us as we didn't spend much time in the flat but if you plan on working from home for example, this could pose a problem.
Overall, we loved our stay and would definitely come back the next time we visit.