Honestly , if you drain the tank and bowl , there should not be any odor (drain it outside of course) , however , as your question originates about in the living room , i used to put my bikes in the living room of my house (yes i live alone) , and then ended up giving the bikes their own bedroom , as i did not have a garage at all , i (maybe i got used to it) did not drain the tanks/bowl and did not notice any odor , nor did anyone that came over to watch Supercross on TV , so either our nostrils are toast , or it did not give off any odor , i can't verify either outcome , but i did have a Gas Heater on a wall in the Living Room and it was a open flame , and nothing ever went "boom" , if that says anything
This is them in my old house , back around 2008 , and i could have started them right where they were , they both had gas in them , i even rebuilt motorcycle engines in the back bedroom
Living Room 450X:
Bedroom 450R:
CRF250R Engine Rebuild:
So , No , your not the only one who has thought about putting bikes inside , but since its a apartment , i would drain the gas , just to keep the landlord happy
As far as the Garage goes , if you don't have a clear view of it , i would ask the Landlord if you can install a motion or movement alarm (inside of it) , the kind that has the contacts that go on Windows or Doors , if the magnetic contact is separated , the alarm will sound *like if the door is forced open* , since its not "your" garage you are limited to what you can do to it , and sometimes they will make you leave what you install if you do move , so take that into consideration when purchasing any kind of alarm system or security devices