Advice on advertising a "potential" 4 bed rental

[Steve Moore]

I close on a duplex soon and want to market to renters. It has four potential rooms for bedrooms, but two of them have closets but are in the basement and don't have windows. I heard you can't advertise as a bedroom unless they have a window. However, due to layout, they could be used for that. Any suggestions on how to advertise the benefits of an extra room? Do I have to list as 3 bedroom (craigslist, etc.) or can I list as 4 bedroom and make a disclaimer? Any suggested wording?