Staying in Joy's place was a magnificent experience! My family and I got everything we could've asked for.
The night we arrived, everything was in proper condition and ready for us to enjoy. The apartment, while not huge, is spacious and comfortable for a family of four, even a few more people would fit comfortably. In case you need housing for extra people, ask Joy. The place is fully furnished and equipped except for a washing machine and a dryer, but there's a laundromat a few blocks away so that'd be no problem.
The bed and the sofa-bed are comfortable and clean. We'd walk an average of 100 blocks per day, and after that, there's no better place to be than in a comfortable bed.
The place has very fast wireless internet, so you can work at night or whenever you need to without worrying about speed drops or peaks. It has a small TV and cable, but I can't comment much on that since we probably turned it on just two times, but seems to work perfectly fine.
The neighbourhood is lively, and can be kinda noisy at night. I think there's a police/fire dept. station nearby, so you'll hear sirens from time to time, but it's not a big deal. I can say it's quieter than most of Midtown. The subway and almost everything (grocery stores, restaurants, laundromats, etc) is within walking distance and easily accessible. As for the safety, it's NYC, like with every big city, you just have to keep your eyes wide open, but honestly speaking, I felt very safe walking around even at ungodly hours.
Joy is a wonderful host, very polite and eager to help. She gave us enough information to move around the neighbourhood without having to ask for much else. Meeting her was a refreshing experience. Just follow the rules and be a good neighbour and I'm sure you experience will be as good as mine.