It depends what your account type is with PayPal.
If you sell something on eBay, than PayPal charges 3.4% plus 20p for amounts between �0 & �1500.
Log into your PayPal account and look at the bottom of the Home page to click on the FEES link.
Say you expect to get �350/week, then divide it by 0.9666 which will give you �362.10. That would be what you would expect your tenant to pay. It's OK within a penny or so.
Ask PayPal for clarification, as they say that either the seller or buyer can pay the fee. Hope this helps.