Could be any sort of L2 charger, HPWC, J1772 or a NEMA 14-15 etc. (240V, >=30A) Is the convenience of having on site charging appealing enough that you'd pay extra for a place?
I would not pay more. I would pick it more likely. To you as the owner it would mean you get more likely a renter making more money in the long run. A 14-50 plug would be the easiest and least expensive to install. Are you planning on installing a meter and charge people for the extra electricity they use?
having a charger does a renter no good unless they have an EV to charge... an AirBNB with a Tesla and a charging station: that's appealing
I have and do look for charging options and a garage to park in. Usually where there is a garage there is a nearby utility room with washer and dryer. With permission, I use the dryer outlet to charge.
The question was from a friend who owns an AirBnB who asked me if I'd pay extra for one with a charger, since she knows that I specifically look for hotels with destination chargers. My reply was that I'd look for an one with a charger (I wish more mentioned it in their listings), as the convenience factor would be worth it, if that rental was a little more expensive, then I'd probably consider it worth the extra. Right now she's looking at a 14-50 or a J1772, to make it as flexible as possible. No extra meter, but maybe keeping the rental price the same and asking people that want to use the charger to pay $5 or so to cover the electricity would be a fairer option.
Yes a reasonable fee for the extra electricity is totally fine. Charging a Tesla can use up to 70 kWh which is $10-20 depending on the electricity price. But having a charger is only worth anything to EV owners. Anyone else would not want to pay more for what they can’t use.