I'm not disabled but I use an electric unicycle to get around the city so I tend to pay a lot of attention to where their are steps.

For the most part sidewalks have ramps so you can get on and off them. There are occasional ones where they don't though. This mostly happens in residential neighborhoods where someone has built a driveway that cuts through a sidewalk. I would say the larger issue is how shitty our sidewalks are. Many have large bumps in them due to cracks and root growth. They also have a stupid habit of putting street signs in the middle of sidewalks which can make them hard or impossible to use, some are made so narrow by this that they are hard to just walk on.

Luckily if you're in Charles Village proper most of the sidewalks are pretty good. We've actually got some of the widest sidewalks in the city, especially for a more residential neighborhood. The bad sidewalks can mostly be avoided once you know where they are. Even our park can be accessed by ramp.

I've never taken a city bus but the circulators all seem to be wheelchair accessible.

The bad news is the houses are mostly row homes with steps. So you'll want to live in one of the apartment buildings. I have no idea how accessible they are, but I'm sure the newer buildings have to meet ADA standards. So with that in mind you might want to look at Remington Row as it's new construction.