You can even team up with the other tenant/s. So like, for OP, if the other tenant’s toilet is messed up too, and the building’s pipes are clogged with roots or something, you can both pay the plumber out of your rent, but you have to do it correctly or you are screwed. This is partly why I think LCI would be a great guide in this, plus, well, this house just sounds like it is in dangerous condition and should be inspected by them in any case. When LCI comes out to inspect, after the inspection, ask them if any of the issues are ones the tenants can pay for out of their rent.