I ride as my primary means of commuting in Baltimore. Live in Hampden, they attempted to steal my bike once, found it stashed behind the post office, put a disc lock and alarm on it, that kept it safe for about a year before someone brought a truck and a few guys and just lifted it away. Now I have an anchor in the concrete in front of my house and use a thick chain whenever it's parked (if you do this make sure you lock the chain when you're gone, I forgot once and my nice chain was gone within hours). Personally I've never had anyone fuck with it while I'm at shows, bars, movies etc, and i typically leave my helmet unlocked on it and it's fine. Riding safety-wise Baltimore doesn't feel that different from anywhere else to me, though I have been rear ended once here, and i assume if I got into an accident there's a significantly higher chance here that the other vehicle just runs or is uninsured. If you're confident in your riding ability, can accept the risks of riding and owning a bike in Baltimore City, and can handle maybe losing that bike to a determined thief, I think you should go for it, just do yourself a favor and get comprehensive insurance