I have been driving EVs since 2010, so I know the problem well concerning top-up charging at accommodation sites. I am also Airbnb host, but when travelling use Booking.com because they have Facilities Filter for EV charging. Host sites that offer and publicise EV charging benefit from higher demand and therefore higher occupancy, so usually provide EV charging for free. However, I acknowledge the right of accommodation providers to charge a fair and proportionate amount for EV charging, just as some do for using air-conditioning, which can also consume a lot of electricity. However, I do object to being ripped-off on occasions where I have been charged more than 10 times more than the value of electricity consumed. Due to EV Charging Filter option on Booking.com, I recommend using them for travelling and Airbnb for hosting.