Legal Question in Landlord & Tenant Law in Illinois

Without seeing the lease it is impossible to give precise answers. However as a general rule.....

1) Except in certain towns (like Chicago, which requires a minimum 2 day notice to enter) if you have put in a request then they should be giving you reasonable notice of intent to enter, which is usually 2 days. If you are saying you want to be home when they enter, that would be a separate arrangement, but to respond to a non-emergency in less than a week is not unreasonable.

1.5) Put them in writing; people lose stuff. Also if you ever need to prove you asked for work, right now you have nothing, and that could be a problem under various scenarios.

2) Federal law requires this and yes we are all stuck with it. You may be able to increase flow by holding down the flush valve longer, but many toilets have a self-defeat that prevents this.

3) Impossible to tell without much more info. If the floors are wood, tile or another hard surface, it may depend on whether the building leases require tenants to provide floor coverings; most do NOT. Alternatively if you knew this then you should know that sounds can be accentuated because of such flooring. But even if the floors are carpeted, about all you can do is to ask management to talk to the neighbor and see if there is a reasonable solution. You can certainly try talking to the neighbor yourself but the neighbor may just think you're overly sensitive. Also, you say it's not the neighbor's 'fault' but if the neighbor is disabled this may just be a reality....