I am in a basement room with no windows. I do a rent exchange for a basement apartment, so there are other windows, just not legal sizes and not in the basement. It does concern me from a fire perspective, but the main door outside is 1/2 flight of stairs away. That said, it is nice and dark and cool and quiet which is great for sleeping in the summer. The girl I watch as part of the exchange is going to kindergarten in the fall so most likely I'll move then, but am not completely sure I'll move. All that said to give the nanny a choice and also consider having a legal egress window installed. I think it's around $2k to have one dug out.