I live in a tri plex. Just put a lock on the door of your grow room and if anyone is suspicious tell them it's a closet that you lock because you keep expensive computer equipment you're not using in it... or tell them your room mate lives in there and is really private and doesn't like people in his room. Some sort of excuse... the best bet is to not let anyone into your house if you plan to grow at all ESPECIALLY in an apartment. Landlords can always request an entry... a good way to cover up your grow if a land lord is coming and you have a full room set up is to use Panda film as a light reflector/black out of your grow room, then if you know hes on his way take it down, put your crop in your car or a buddys van/ truck with canopy... soemthing, black it out with the panda film on your walls, and park the bitch in your garage locked... they can't open it, and they wont want to, usually a llandlord inspection is just to make sure you aren't tearing the place up anyways. This is what we did in our buddies van. Then we used an inflatable air mattress, covered it with blankets, put up a fold up table, slapped some posters on the wall, and stuffed my lights in the closet. Landlord never suspected the room was anything but a bed room and it only took me and my buddy about 2 hours to tear it all down and make it look like a real bed room... and that 2 hours was without urgency and a lot of toke breaks.
Good luck, hope my experince helps out a bit.