Hi @Brian893
Airbnb used to run the very service you suggest, before closing it last year!
They now partner with large management companies (in major areas anyway) so favour this approach to matching local hosts together, which I suppose doesn't generate them any money.
Most of these companies won't be able to support hosts on an occassional basis, like if you happen to be out of town- so are unless you want to use them full-time!
A host here on the CC has said he's going to create a co-host matching forum, but I don't know when that would happen or how he would advertise it.