I'm visiting the Kanto area for other reasons, but I managed to visit this cafe in Tōkyō, near Akihabara. I just wanted to share with you all a bit of my impressions. Short story, I'll try again next Saturday.
The place is a modern 2nd [*] floor bar, both soft and hard drinks, no smoke while I was there (no trays either, and I didnt smell any stale smoke, but I didn't actually check if it was smoke free), with both a robot (a physical one) and a computer for those who want an electronic opponent. But considering the general ambiance, I think you'll enjoy much more playing with someone else. I managed to play against a 6d and a 10k and everyone was extremely pleasing to play, talk or be around. Mostly young people (I think late high school, maybe early university), and some adults one or two generations above
During afternoon (13.00 to, I believe 16.00) you basically pay a 2000 JPY cover for the while afternoon and a soft drink. Totally worth it.
So, really, if you're in the area... Do note though, that they only open Wednesday to Saturday, both included, 13.00 to 23.00
Take care.
[*] As in, one floor above ground. I think first floor for most Europeans.