I live by myself in a studio rental in an apartment house in Lyon where water consumption is metered although not visible to me. That is, the hot and cold water meters are in the apartments but do not indicate actual usage. After two years of residency, the apartment owner says he will soon present me with my first water bill of 463 Euros which seems rather high, but I have no experience to judge. Does my bill appear high to others? What can I do to confirm my actual usage? Thank you for your advice.