Society Hill Sheraton
Stayed there two months ago. Safe. Great location. Rooms not that great - don't accept a room on the "view" side if you are a light sleeper because the street below is VERY LOUD!! I didn't find any of the rooms particularly inviting. I doubt I got an upgrade even though I specifically requested one. Service was okay. SPG lounge was okay - at least there is one versus the Westin not having anything.
If you like sushi - Morimoto (723 Chestnut) is fantastic.
Good luck!