Hello
I am sorry, I not understand what you mean "swimingpool rentals" is it of part of house or not ?
In real estate manager you may move to rent only "properties".
ordasoft.com/Real-Estate-Manager-Software-Joomla.html
Yes you may rename all fields and rent "swimingpool" or some other. But you will need do a lot work for fields rename.
Bettet if you will use CCK - there you may move to rent(to booking) anything
ordasoft.com/cck-content-construction-kit-for-joomla.html
Regards
Andrew
OrdaSoft team