I've got a coastal Maine guest cottage I've been renting out on Airbnb for about six years now. Put in a NEMA 14-50 last spring after enough guest messages asked about EV charging, wired it myself with help from an electrician friend rather than keep putting it off. Now I'm stuck on the actual billing question: charge per kWh through the charger's own app, or just fold the cost into the nightly rate like I do with everything else in the cottage. Had two guests back to back plug in every night of a five-night stay each, and the electric bill for that month was noticeably higher than what I'm used to. I'm on a fixed income now, so every recurring cost on this place gets a real look before I decide how to handle it going forward. What are other hosts actually doing here — metering it, or just eating the cost?