Services limited to the amount of rooms or items
From SimplyBook.me
For those companies that are restricted to amount of rooms or items we recommend to check Limit Bookings Custom Feature.
This Custom Feature allows you to restrict booking quantity which can be booked at the same time. This Custom Feature is useful when your services require additional things like dental chair or room in the studio etc. When the booking limit is reached the corresponding time interval will looks like breaktime at the booking page (and in the admin interface if you haven't set to skip this restrictions for admin). It is possible to limit booking number at the same time generally, and also you can set certain limit for each service separately.