We stayed at Carlos' place on East 54th St for about 3 weeks while our apartment was being renovated. The location was great! Plenty of restaurants around the area, lots of fitness centers like Equinox, Blink, and Soulcycle across the street, and walking distance to the Subway. The place is a bit darker than the photos would lead you to believe (the apartment is in the back of the building so not a lot of natural light) but it was quiet and clean.
We had a few issues with this place. Firstly, when checking in, the room was not cleaned yet. This was due to a mix up in check-in time. Secondly, during our stay there was construction on the roof and they were throwing debris over the edge of the building, landing in the terrace. This made the terrace unsafe to use for all of our stay, which was a bummer. Carlos handled both of these issues promptly and professionally and we were able to resolve them both.
Note that it's listed as a 1-bedroom apartment but it's really a studio with a room divider.