I enjoyed staying at Moe's place. I never ended up meeting him, but his son, Stefan, was very nice and checked me in. The room was nice and cozy and the private half-bathroom and separate entrance were added bonuses. It felt like I was staying in a little apartment. I never had trouble accessing the main bathroom.
The neighborhood was peaceful and charming. Public transportation was never more than a 10 minute walk away and I could get to the center of Berlin in about 20 minutes. I would definitely recommend staying at Moe's.