We stayed for 10 days, and in our opinion the room is perfect even for longer stays.
If your goal is to be mostly out and about, the room has everything you might need and Felipe (and his family) are always happy to help! There's enough space for two people and you get your own toilet (bathroom itself is shared, but we had zero trouble with that!)
Felipe's dog Lily might be scary big, but is timid, lovely and very well trained. She is curious (as is every dog, lol) but not obtrusive and will not bother at all. We loved her!
The place is very close to Central Park, two giant malls and many places to eat out. It's an insane value for money!
You will have a lot of privacy, but keep in mind that right outside of the room is the kitchen/family room and the sound isolation is quite poor. We weren't bothered by any noises at all, but keep it in mind if you're looking for something more secluded.
I would definitely recommend, and if we're ever back in NYC, we would love to stay at Felipe's place again.