Music studios are rather inexpensive in Japan compared to many places in the west. Also, for a reasonable price you get a good quality room with high grade instruments for rental. I will be definitely carrying around my Nord Electro 5 for gigs. However the studio I often use in Shinjuku, Tokyo has a Nord Electro for rental. I would rather rent than carry my own keyboard on the crowded trains or driving to Tokyo.
Another thing to note is how missing equipment will always show up. It is so easy to forget cables and smaller music devices. The staff will carefully check the rooms and put these items aside for you. If you call the studio at a later date, you can always guarantee that they still have it. I left my iPhone lightening adapter there one time. Two weeks later, I asked the studio, confirmed my name and the room I was using and they returned it neatly taped to a square card.
Our bass player left his cable one time. Called them a week later and it was still there. Even if the staff don’t check the rooms between sessions, nobody here in Japan will take your stuff. They will hand it in to the reception anyway.
Popular studios in Japan.
NOAH Studio – is probably one of the biggest music studio chains http://www.studionoah.jp/
One of the most expensive however the rooms tend to be nice and clean with top of the range equipment. For beginners, Intermediates and Pros.
Sony Music Studios – A more expensive studio for mainly for professionals http://www.sonymusicstudio.jp/s/studioen/?site=studioen#section1
KRH Studios – Similar to Noah Studio but with only one location http://www.krhstudios.jp/contents/access.html
Cloud 9 Studios – Good clean studios that have around 7-8 branches around Tokyo for a decent price http://www.cloud-9-studio.com/
Music Man – One the one branch in Shinjuku with around 7-8 studios inside. This is studio we actually used mostly. Equipment is a little old but decent and enough for rehearsals . Very cheap too, especially if you have around four or more people. I often rent the Nord Electro from there. http://www.music-man.jp/
Of course there are many many more to list, especially the small house type.
Another thing to note about the studios in Japan is that most people tend to be in the rock /pop type genre. The way they dress, often in dark clothes also seems to fit into more of a rock genre. The rooms are of course sound proof once you lock them, however you can hear leakage if the doors are not closed probably. 90% of the time I just hear rock, metal or rock sounding pop. We do Neo Soul, R&B and funk, which seems rare. But I guess Rock is a little easier to learn for larger groups and fun to play too. Much easier than our complex chords progressions and odd time signatures.