Everything worked smoothly and Kathrine was very responsive to any messages on Whatsapp. Leaving the notes in the flat, along with maps etc was a real help. The building felt secure and is a short walk from some great places, plus a good stepping off point for exploring Manhattan, especially Empire State Building and up Fifth Avenue. However, if you aren't used to city noise, I'd take some ear plugs for the night time - though I guess that's pretty common across Manhattan!