Give it a try, it's a great idea and you'd be a great host, besides they could learn a lot from your experience and specially when it comes to saving for the future, etc.
As pointed above by @Storm4U clients would freak out if they know someone else is in the apartment at the same time. I know a local escort who stays with a friend in SF and after telling potential clients "I'm going to be a friend's place" the follow up question was: "will he be with you all the time?". Right away he simply started saying he was renting an Airbnb all by himself... If you're in the "back of the flat" make sure to be invisible and silent.
it would work, obviously sleeping times and other things must arranged upfront and as you know an escort's schedule is pretty unpredictable.