Replace the blind usually $5 at Wal-Mart sometimes you can even find them at the Family Dollar, and scrub the carpet pretreat stains with vinegar rent a cleaner usually around $50, and use vinegar about three cups in the tank with your water that should bring up alot of the stains. As long as the apartment is clean, walls wiped down,cabinets cleaned, etc. the landlord may let you slide on the carpet depending on how old the carpet is and how it looked when you moved in, carpets do not last forever especially in apartments with kids, he may have been planning on replacing it soon anyway. Clean it as best as you can and fix the blind and hope for the best, you get some money back, but expect the worst, he keeps the deposit. Good Luck.