My partner and I just spent a week in this lovely little pocket of Rio. The space is exactly as the posts reads and while we didn't meet Mu, we met, chatted and shared a few "cafezinhos" with his colleague Alex. He is lovely guy, very welcoming and full of great tips of local delights.
The space is very private and the local area is really chill. We work on the road and had plenty of space to set up and be productive while we were there. Will definitely look up Alex and stay here again next time we are in Botafogo.