Cozy Gallery. The other day I participated in workshop of making leather business card case as I simply lost one.
Personally I like Japanese old house. The place is also over 90 year old with renovation. There are many events are going on such as textile exhibitions, Sake night etc. Not only events but also they publish books about arts and maintain online media about traditional/modern arts.
You can just drop in if you are around. It is close to Tsukiji Market.