Running a B&B
Sorry, no I'm not aware of any maximum but unless you have a weigh scale at your check in and you can ask people without insulting them then I guess this is no use. I think anyone who is that heavy...
I've got one but I don't think many people realise it is, performance is very dependant on how good your WiFi is. An option is to add a ChromeCast to existing TVs or better still hire one out to Gu...
You need to cover that in your Terms and Conditions
No answer for this other than you will have to chase him for the payment yourself. Maybe next time you could charge a deposit for the safe keys.