If your not likely to be bothered, put a towel under your doorway, crack a window, use some aromatherapy oils (something citrus, that way it blends well with the weed smell to make something fruity), but not too much, and try vaporizing at lower temperatures. I don't think you'll have any problems, then again, I don't know the specific layout of your apt. If you have vents, make sure they are covered. As others have said, the odor from vaporizing is significantly less but still noticeable (especially for those that know 'the herb'). It's a lot more of a 'flowery' smell. I don't even remember what weed smoke smells like.... campfire?
Blowing hits out the window can be tricky because of wind & cold. If your seriously worried, just get a trash bag and blow your hits in their. You can rig a plastic bottle or something as a 'mouthpiece'. The smell will just dissipate in their and you can fold it up, throw it away, or expel it out the window. We use to do this a lot when we smoked. Worked wonders. I know.... some might call it a buzzkill, but I think vaporizing outside, in a car, being sneaky or possibly caught is a worse buzzkill.