photostudio.org
Studio rental turned into a proper market when photographers started booking space by the hour through platforms instead of maintaining their own. The platforms now compete on inventory and discovery, which is a naming problem as much as a supply one.
Photo studio is what the business is called everywhere, in plain English, with one spelling and no regional variation. Portrait studios, rental spaces, commercial production facilities, school photography operations, all of them.
A directory or booking site at this address would be understood immediately by both sides of the market. It also suits a trade association, a training provider, or an educational resource for people learning studio lighting, and the .org reads correctly for all three.
For a marketplace the extension costs very little, since that kind of business acquires through search and referral rather than direct type-in.
Listed for sale. Enquiries welcome.