Both Chingale and Della Notte are very good Italian options...I have eaten at both and would give Chingale a slight edge on quality and menu options. Other options in the Harbor East area:
Wit & Wisdom - new Michael Minna restaurant in the Four Seasons
Roy's Hawaiian
Charleston - usually the highest rated restaurant in Baltimore but it's very expensive
Pazo - great tapas place that's very popular

All the restaurants I have recommend and the ones previously recommend by others are closer to the Marriott Waterfront....which by the way is better than the Marriott Inner Harbor at Camden Yards.

Only place closer to the Marriott Inner Harbor that I would recommend is the Capitol Grill for steaks. Whatever you do don't get suckered into Phillips, McCormick and Schmicks or the Rusty Scupper for seafood...they are tourist traps.