My partner and I stayed for one month, and we loved it!
The place was super clean and everything worked as expected. The apartment had great lighting, the kitchen was super functional, the fridge/freezer were much bigger than expected, the bathroom was modern, the bed was comfortable, and there was so much storage space. We brought many more things that we should have taken with us--but even then, there was space for more. We never heard the neighbors inside the apartment, the blinds were great to block any morning light when we wanted to sleep-in, and yeah--having a W/D in-unit was luxury. The neighbors were also cordial.
Funny enough, the UWS wasn't our initial choice but in retrospective, it was the best choice. This place is perfectly located between multiple subway lines--making it easily accessible by public transit--and you have everything at walking distance, from great coffee, delis, supermarkets, restaurants, bars, and the best... Central Park. I was commuting to Chelsea--so it was a breeze.
Izi, and the full management team was always available, accessible, and ready to provide help. They were incredibly organized, I was surprised--they are clearly professionals. When arriving, I was asked if there were things they could change or fix--and I suggested two small things and they immediately fixed them (a drawer didn't close properly, minor issue with a kitchen cabinet). Honestly, I just told them as I didn't want to be told I broke them--but beyond that, no single issue during the whole stay.