There is quite frankly no such thing as off-campus housing. The town of Wellesley is very much catered (in all aspects including night life) to its extremely wealthy population. There is no such thing as affordable off-campus housing. However, some students will live in Boston, which is a very big hassle considering Wellesley in +45 minutes away from Boston. Usually students who do such, however, do so because they are not fond of their experience at Wellesley and hope that living in Boston will make them happier. Don't be fooled by the brochure and campus tour guides. You will not be popping into Boston unless you really have some time on your hands.