Great hotel in the middle of everything!
We arrived at the Philadelphia Marriott Downtown at 12:30pm on the Sunday of President's day weekend and were expecting to have to wait around for check-in which is usually at 4pm. I thought it couldn't hurt to ask for an early check-in, and it worked! We were given a VERY nice, clean room on the 17th floor with a king size bed. Thanks to the very nice concierge, we were able to watch the Knicks vs. Mavs before headning out to explore! :D
This hotel is right across the street from the Reading Terminal market which was awesome! We frequented this place for lunch/breakfast the next morning since we were only there for a day - but had we been there longer, we probably would have gone there more. TONS of good food, fresh produce and other goodies. The hotel is also next to Hard Rock Cafe where we had dinner. 
We walked the 6 blocks to Independence Hall and Liberty Bell - very good, historical experience. 
All in all - we would definitely stay at this hotel again if in the area for any reason. We were really happy with the experience here!
Pros:
- Early Check In (at 12:30!)
- Clean room (not just a little clean, MY kind of clean! - also checked for any bugs, NONE found!)
- Fast Elevators
- Very courteous concierge
- Right next to Reading Terminal Market
- Walking distance to Independence Hall (brisk 10-15 mn walk)
Cons:
- SUPER expensive parking! $45.00+ tax (we parked at 5-star parking RIGHT next door for $36 in an open lot and saved $10)