Good space, layout and amenities in a great location. Our family of four stayed at Ryan's place the week of July 4th to see sights (Statue of Liberty, Ellis Island, Empire State Building, Brooklyn Bridge Park, Brooklyn Museum, American Natural History Museum) and hang out with friends near Union Square in Manhattan. We'd definitely recommend it for travelers with similar destinations in mind. Being just a few blocks from the L and G subway lines was perfect for zipping into Manhattan or getting elsewhere in Brooklyn.
The apartment feels quiet, private and secure; we heard barely a peep from the guests in the top-floor unit or the rest of neighborhood, with the exception of a few fireworks on the 4th. The layout -- with bedrooms upstairs and kitchen and living areas downstairs -- worked well to let our kids sleep while we got our morning caffeine fix or enjoyed TV or music to wind down at night. The bedrooms and bathroom were just as large as those in our suburban single-family home, and the whole place was thoughtfully furnished. Street parking seemed plentiful, and Ryan provided all the tips we needed for nearby grocery stores, restaurants and parks. His communications were friendly, prompt and clear.
If traveling with very young children or people who could have trouble with stairs, bear in mind that the two floors are connected by a narrow and somewhat uneven staircase.