An empty closet wont work unless you have a carbon filter and fan in there also. I cant even begin to describe how much smell there is during harvest. Its not only the plants out of the room but constantly being adjutated from handling during trimming. You will not conceal the smell in a town house without having a carbon filter running in the area you are working in.
I have a 8x4 with 1200w running in a room that is 10x6. The only way i can control smell is to harvest in that room completly. I can't pull plants out or my whole house smells, both floors. If you are running all the same strain you could harvest inside of your tent. If you are running a veg area you will need to keep an eye on the smell. My veg stinks up the second floor of my house.
But dont panic you will have plenty of time to build up equipment. But you will need to figure out something for harvest, and that equipment can be put towards a veg area in the future. So its a win/win.