I should start by saying that Kyle is a very attentive host. He sends a brochure in advance of your stay with details on how to get to the flat, NY tips, etc. Unfortunately we didn't meet him, but he sent messages to ensure that we got in okay and offering further recommendations - I really couldn't fault his hosting skills.
However, the flat itself let him down a little. The bedroom is on a very busy road, so is very noisy - we knew this from other reviews and Kyle does provide earplugs, which work well, but some guests may not be able to sleep through the noise (luckily we got on well with the ear plugs). The flat was also in a fairly untidy state when we arrived (e.g. dirty socks on the floor, cluttered kitchen counters), which also limited our star rating - a quick tidy could have significantly improved this.
The flat itself is in walking distance of Times Square and Central Park, which we really enjoyed. Other sights are a metro ride away.