Legal Question in Landlord & Tenant Law in Illinois

Based on your zip code, you're in Chicago, and may be covered by the Chicago Residential Landlord & Tenant Ordinance. Sounds like the landlord was responsive and fixed the problem, but it took 3 weeks. The Ordinance gives you the right to fix minor things to a point, and to terminate for major things, but only if the landlord is not responsive. Otherwise, your lease may have a section about partial abatement of rent in case of situations like these, but generally full rent is payable but there may be an insurance claim for loss of use if you have the right kind of renter's insurance. Otherwise, and in absence of a lease provision allowing you to deduct anything, full rent is owed.