Raccoons are one of the most common animals that are rabid - but it is still a small chance. They are very destructive and will cause a lot of damage in your house, and if they fall through the ceiling into your living area, you are going to have a scared and angry wild animal with sharp teeth and claws loose in your apartment. Yes, they are peeing in there. Get the landlord to take this seriously, and "help" him out by providing the names and phone numbers of pest companies who will trap them. If they do get in the house and bite someone, then you have a lawsuit you can file against the landlord. Document the times of your conversations - get them in an email or text if possible. You will have a problem when one drops through the ceiling and panics. Raccoons are not inherently aggressive, but a scared one can be nasty. Don't attempt to touch one, just get out and go immediately to your landlord and demand action. You can also call the health bureau where you live and see what the laws are about things like this. They may be able to call your landlord and force action based on that as they are considered a health threat when indoors.