I hate to say it but if he's so bad it's your own fault for making him the guaranteer on your lease-that's just common sense. He arguably does have some right to check the apartment since the responsibility of it is ultimately on his shoulders-you've essentially made him your financial babysitter. He shouldn't though unless he has cause for concern like some sort of worry that you have a bf/gf staying over, doing drugs, destroying the place, etc. If he's that nuts he probably does think such things are going on. It's a little too late to fix this. Just do your best to cope with it, try to be friendly/get along, don't rock the boat to give him further reason to think he needs to check on you and the obvious: don't put yourself in this position again when you sign your next lease. Hate to say it but if you don't have the funds to rent, you shouldn't rent...you just need to swallow your pride and find alternatives regardless of how unpleasant they are. That's life...that's what being an adult is about-being responsible...we all have to do it...now it's your turn.

Guarantor has no such right. This would be analogous to a cosigner on your car loan claiming he has a right to use your car. Call the police if he attempts to enter your property.

If he is listed as an occupant or was given a key, he can. Otherwise, no.