There is a Pharmacy on the main road pasing through Faliraki that should be able to help you with wheelchair hire. We stayed with friends 3 years ago and remember hearing that somone had rented a wheelchair from this shop.I'm sorry I don't have contact details for you. I believe that the owner is a guy called George, maybe someone else would have contact details. Next time I pass through I'll see if there is a telephone number for them.