How do you split charging costs at a group accommodation?

At a group accommodation, multiple guests charge at the same charging point, which without separate metering leads to guessing and unfair distribution. If the charging point gets its own metering point, each charging session is billed separately from the rental: whoever charges pays themselves, via a credit balance, and fellow guests who don't charge notice nothing of it. The host sets a price per kWh themselves and receives one overview monthly. Without a charging point or with low demand, this solution is not worthwhile.