As I mentioned before, this seems a little bit odd to charge for EV charging when you aren't charging for laundry, cooking, heating water, etc....
but
There are lots of companies that make equipment for installation at small business, hotels, apartment complexes, etc.... that would work by credit card or using an account...that would be between the driver and the company that makes the equipment. I'm not sure though about what sort of relationship they have to pay you for the juice though...
I think you should probably contact
https://www.chargepoint.com/
or
https://semaconnect.com/
maybe
https://www.evconnect.com/
maybe
https://blinkcharging.com/
...these last two I think operate on the model that they own the equipment so there's some agreement or cut they take. Maybe true for all of these, I don't know.... Not sure if any of these credit card or account type payment equipment are the kind of thing you can buy and own yourself. I feel like the 1st two I listed might be the best bet
and there are lots of others too...these are just the ones I've seen a lot.
and
I'm not sure if it applies to your situation since it's not your residence, but look at the tax credit potential for the expense of installing EVSE
https://www.irs.gov/pub/irs-pdf/i8911.pdf
I'd suggest that also you contact your electric company...they might have something to offer.
and it seems like you still might be fuzzy on the actual electric usage....Maybe this will help.
My car is an Audi E-Tron...roughly 220 mile total range and my useable battery is I think 83.6 kWh. I've been on several road trips in it, and would rather drive it on road trips than I would my wife's buick. It doesn't have quite as much range as say for example a tesla Y or tesla 3, but it's on the same general order as those or anything else you'll see today being used on a road trip. Some of the smaller cars don't have the range for practical travel....so mine is probably a decent example of what you would likely see. Also, mine is perhaps not quite as efficient as the Teslas, and other newer cars that are coming to market, so in a way it's kind of worst case. The teslas get more range out of a similar sized battery.
Taking a snapshot of one of my typical commuting days. I start every day with 80% charge. Last Friday, I drove 48 miles, and then recharged back to 80% using 19.97kWh for an estimated cost of about $2.25. I think it's actually a little less than that but this is what my chargepoint EVSE phone app is reporting as an estimated cost. About $0.047 per mile at my rate of about $0.11 per kWh. Your rates might be different and you can adjust accordingly....
19.97kWh is on the order of roughly 24% of my capacity
I'd suppose a typical airbnb tenant coming from some distance away will likely arrive at a rather low state of charge, so the first night would be the biggest charge. They'd probably arrive with say 10-20% in the battery
and most likely would set to charge to 80% or thereabouts. Typical practice is to not charge to 100% until just before going on a long trip...so they'd probably recharge about 70% (taking it form 10% back to 80%)...or about 3x my one day example. Let's call it 4x to be on the high side
so night one is maybe $9 on the high side. If they do a little local driving every day, they might use another $2-$3 per day while they are there if they do a lot of driving.... but are they sitting by the beach or pool all day?.....then the morning of their departure they'd probably take it back up to 100%...so add another $2 or so to that last charge to take it from 80% to 100%....