A few things come to mind:
- Tenant must clean out the place at lease termination, including garbage, etc. Cleaning costs will be billed to the tenant. The term used in New York City for this is "broom clean" ymmv.
- Terminate the lease at a specific time. (ie. September 30th at 3PM)
- Make lawn mowing, filter cleaning, etc a credit off the lease. If the tenant doesn't do it, they don't get the credit.
- No waterbeds.
- Rental is for living purposes only.
- A severability clause that protects you in the event that a clause of the lease is thrown out in court.
You should talk to a local landlord association... there are all sorts of crazy rules about leases that vary from location to location.
In general, if you're in a lousy neighborhood, you need the 12 page lease spelling out all sorts of minutae. A family member inherited and rented a building in a "transitional" neighborhood in a big city and added a clause stating that human and pet waste must be disposed of via the toilet and not stored. He lost an eviction case with a tenant hoarding the stuff and ended up needing that clause.
In a good neighborhood with high rents, you're more likely to be renting to a more sane clientele, so a less specific agreement will do.