David's place is one of the top 3 places we've ever rented and we rent vacation homes frequently. It was squeaky clean, nice modern interior, plenty of space to hang out in, comfortable sofas, comfortable beds (we only slept in one but both rooms seemed the same). Great for cooking, although we didn't cook as the location of this apartment is fantastic, with loads of restaurants around the corner and directly below. The bedrooms have sky lights as the apartment doesn't have a lot of windows so the sky lights all through the apartment made a huge difference. At night, though, you can close an automated shade over the skylight in the bedrooms in case you don't want to wake at dawn.
And yes, the apartment is directly above a restaurant and right next to the El. As for being close to the El, that just made this place even better as it was so convenient to take public transportation to most of the tourist locations. David has done an excellent job at sound proofing and as he mentions it's not going to be 100% quiet. The restaurant below finished early, perhaps 11pm at the latest. They also serve lunch so you could sometimes hear music coming up from below late mornings. We just turned on our own music and were fine. Plus, we spent most of our daytime outside of the apartment anyway. And yes, you can hear the El but it's like a dull or dampened low bass sound, in no way did it negatively effect our sleep. Basically one really has to focus on it from the bedroom to even hear it at night. There are ceiling fans for white noise, too.
David's communications were excellent and getting into the apartment was a breeze.
I highly recommend David's place, especially for two couples (we were supposed to be three but my mother in law had to cancel at the last minute) or a family with a child or two kids who don't mind sharing a king sized bed. There is the futon couch for an extra bed, I didn't sleep on it but it was comfortable for sitting. It looked good for sleeping, too.
We hope to be back next year and we will definitely rent David's place again.