This really depends on your lease. Typically I have seen that landlords are responsible for the major systems throughout the home (appliances, roof, plumbing, electrical, etc) as well as any other minor repairs. Often times landlords will also maintain the landscaping and the pest control as well, but other times tenants are responsible for those items. If you are willing to maintiain those items, you may be able to negotiate down the monthly rent.
Read any lease carefully before signing and let us know if you have any other questions!
The Chuck Smith Group
#1 Real Estate Sales Team in DeKalb County