Josh is an incredible host and most importantly, a genuine person--definitely the best Airbnb host I've ever had (having a handful). You can expect consistent and reliable communication, good local recommendations, check-ins to ensure your stay is comfortable and safe, and honest conversations.
Prior to being in East Harlem, I heard it was dangerous, but it was fine. Just like any new area you haven't been to, make sure you are conscious and not disruptive in public.
The room and space was what you see in the photos; expected. It can be a tight space, but it worked out well for us.