i have been living in the same little older house in cordoba provence for 7 years and have a good relationship with owner. i have always paid 6months rent, due again in june. i was thinking of a 20% increase being fair, but owner thinks it should be higher. i have tried to look at all the rates of inflation, consumer price indexes ,etc and just get more confused! most rentals listed in my little town are for temporary and so didnt help for comparison...in general, what have you found for percentage increase in your rent? maybe setting rent rate is too individual a negotiation to generalize??