I definitely recommend Kobayashi Dojo.
It has 26 branches in the Tokyo area. You can attend as many lessons as you want to at any one of these dojos if you pay the fees at one of them, the same amount of fees how many times you practice.
There are some who practice six to seven times a week by going to one dojo in one area and another dojo in another area taught by different senseis.
The senseis are all great. They know both practice and theory. The members are all very friendly and like having friendship parties.
They hold a two-night and three days gasshuku (training camp) in Chiba in November every year, and each of the affiliated dojos has its gasshuku once a year.