Hard to know where to begin because everything was so perfect.
Arthur and Ed have a beautiful penthouse in a quiet area of Chelsea. Close to public transport and just next to the Highlife park (which I highly recommend!). You really feel like a friend place instead of an Airbnb what is really appreciable.
I can't say anything about cleaness because cleaner come before each stay.
Arthur and Ed wrote a paper with all sites to visit in Manhattan. The paper is about 50pages. At this you should add all their advices and hacks! We followed their recommendations and our small 3days trip was so perfect!
I'm not highly recommend to stay at their place, I would say you'll miss something if you're not going at their place!
Wish you all the best for the future and thanks again for everything.