I recently had a guest with Chrone's Disease. I didn't know what that was before, but found out the hard way, after days of him stinking up my flat with dihorhea and not being able to breath in my own house, and not having any appetite to eat due to the smell. Finally, I had to evict him because he eventually soiled the bed - confronting him about it was awkward for all and not something I would wish on anyone. He was a nice, reasonable guy and left without any drama so that was fine... but my question is, are there any minimum requirements for guests? Because, while I'm sypathetic to people with medical conditions, I don't feel that AirBnB is suitable for someone with this disease. I am not a hotel and don't have full cleaning service to deal with these things, and that is why I don't charge hotel prices. Therefore guests should be of a certain standard - they should be independant enough to find a house on their own, they should leave the place reasonably clean, and I believe they should be healthy enough to get to the toilet in time to do whatever they need to, and not damage your property.
In the end, I decided not to leave a bad review because he would just create a new account anyway if I did that (as his was blank to begin with). But, I do believe AirBnB has to start taking some responsibility about this. Currently there is no rule about minimum requirements for guests (while there's plenty of minimum requirements for hosts) and this should be addressed. Perhaps it should be stated upon sign up that guests must be a certain level of health, safety and hygeine, and cannot enter someone's home knowing they have this kind of illness without letting the host know.