My son has a very specific list of things he wants in a college, and one school that ticks all the boxes is Ursuline College outside Cleveland, a tiny women's college.
At first, for obvious reasons, I thought it simply wouldn't be an option, but apparently Ursuline does accept men, and about 9% of their undergraduates are men. They have one floor of one door that is set aside for them. However, they continue to define themselves as a women's college. If you look at their website, it's all about being a women's college, with an occasional reference to "plus men".
My son seems to think this isn't a problem. But, I'm curious what other people think would be pros and cons.
My son is straight and cisgender, which I mention only because I understand some of the reasons why a transmen might choose a single sex school, and also some of the controversy there. Those reasons don't apply to him, although some of the reasons why some women object to transmen on campus (because they want to keep it completely female) would apply to him, and I worry that he'd feel unwelcome.