Stay at the Radisson Lord Baltimore. Mention Johns Hopkins interview and you get a room for $89. Not a bad hotel, and you get free wireless internet. If more than one of you stays there, you can share a cab and the total is $10 split between the number of people. PM me if you have any additional questions. If you are driving, it is $31 for the entire day for valet, which I thought was better than paying $19 for a public, sketchy garage. The $31 valet allows you to park until 6PM the next day, so it is worth it.