Public transit is not great but as mentioned JHU has a pretty good shuttle system which should at least take you to everything in a certain radius. For housing you will find a lot of rowhomes and in CV I've noticed they often have stairs to walk up to the entrance. I've however seen plenty of accessible apartment buildings, but they'll probably be more expensive than the less accessible options.

I would definitely reach out to JHU's Housing Office because they will probably know the best accessible housing options in the area and can give you an idea of what's available. There are also some Facebook groups of people who are looking for roommates or sublets, just search up JHU Housing and you can browse through what people are posting- they often will also post about what places/landlords to avoid lol.

Baltimore has its ups and downs but I genuinely enjoyed my time living there. It has a rich history and culture and if you have any interest in art and anything quirky you'll have a great time. The food scene is also amazing! I hope you're able to find all the information you need and if you end up in Baltimore, I hope you really love it!