I only got to stay one night at Min's, but Min was very welcoming and friendly. I wish we'd had more time to chat and I could check out the area more which was in the heart of "korean town". His place is very convenient for Shinjuku, just a few minutes walk from several stations, Metro and JR, and an easy walk to Shinjuku station itself.
I had a private room, which was fine. Clean and tidy. It was one of the wooden floor ones, so a bit hard, though Min provided plenty of futon bases so ok for me. Others may prefer a tatami room.
There were several other people staying and it was quite lively, but didn't disturb me.
I'd stay again!