I recently stayed one night at the Residence Inn when I had a meeting to attend at another nearby hotel. The Residence Inn was half the cost of the other chain and every bit as nice. The staff was friendly and helpful. They were helpful even after I had checked out and allowed me to use the computers to check on getting an earlier flight home.
The room was gigantic. I stayed in a one-bedroom suite that was about the size of my first apartment. The kitchenette had 2 electric burners, a large refrigerator, a full sized microwave and even a dishwasher. Everything was immaculate and the bed was nice, just the right firmness for me. Both the sitting area and bedroom had a large flat screen TV.
The breakfast buffet looked amazing. While I stuck with the freshly made oatmeal (which was great) they offered about everything you might want, including grits pancakes, sausage, potatoes and cereals. They even had a make your own waffle station. The only thing missing was the man in the chef hat making omelets to order (they may actually offer this, I didn't ask).
The bar/restaurant was also great. When I couldn't find anything I really wanted on the menu for a snack, the waitress offered to make me a bowl of chips and salsa. The chips were great and the salsa was clearly freshly made in their kitchen, not from a jar.
As this was a 24 hour in-meet-and-out trip, I didn't explore much, but the Inner Harbor, Camden Yards and the convention center were all within easy walking distance. I would definitely stay here again if I was coming back.