I cannot find a way to contact supervisors at airbnb. The hot water in the building was broken for 1/3 of our 8 night stay. We asked for reimbursement. Owners out of the country. (We were asked after we paid etc.to tell the super if he saw us that we were friends.) When hot water broke we couldn't reach owners, and had no local contact. Owners and airbnb calling it inconvenience. How do we contact higher-ups at airbnb. Thank you.