I'm currently house hacking a 2-unit building in Federal Hill. I listed it on Zillow, hotpads, apartments.com, and on a local Facebook group (Federal Hill Roommates and Rentals). I listed it for what I believed was a pretty appealing price and had a lot of interest. Once the apartment was in move-in ready condition I had it leased to great tenants within a week or so.
I think there's probably the most interest in June/July/August, but people are definitely starting to look already based on the conversations that are happening on the Facebook group. I would think that if you get some good pictures and price it correctly, you should have no trouble getting tenants in a very short period of time.
This is my first time renting to someone, so I am by no means an expert, but the tenants that I picked were ones that had good references, good credit scores, and I was able to talk to their previous landlord who gave them a good recommendation. They also met all the other requirements that I had regarding income. The lease that I used was a combination of bits and pieces of a few different Baltimore City leases that I found online or got from other landlords.