I am the Best Tenant in the World for my landlords and when they had to raise the rent they told me it was because their taxes and water/sewer went up, despite appeals to the town. I totally understood that (their costs went up, they weren’t just trying to make more off me); they were paying more themselves and passing a portion on to me.
I paid $475 and they raised it to $500 and I wasn’t bothered at all. We’re friendly acquaintances, we always let each other know how great the situation is, etc., and $500 for a big place in an area where housing is getting to be a premium is a good deal.