During late flowering your whole house/apartment will smell even with a few plants, even with strains that aren't that smelly. Carbon filter is the best way, but I used an onna mister in the room next to my flowering room and it masked the smell alright, to the point that my one roommate that didnt know never figured it out.
Ultimately honesty is the best policy, but I own my home and used to rent to friends, so when i did tell them they knew they would get kicked out if the word left there.
I had a customer trying to grow in his closet without his wife knowing, he's a total square leader of the church and everything, he asked my opinion, I told him to tell the truth and it worked out great, his wife even helps him =)