I was in Baltimore for four days last September for a convention and had a very good time. I was in the Inner Harbor area, which I was told is the only good part of the city.
There are narrow corridors of the city proper that are good (up Charles St to Johns Hopkins/museum area, e.g.). Unfortunately, they are too small to really count compared to the 90% that isn’t.
It was once a great city, as my mother could attest. 1968 happened.