Excellent Location; clean spacious rooms, horrible restaurant!
My wife and I recently made a quick 3-day weekend trip to Philadelphia and it's surrounding Amish Country. After reading many TA Hotel Reviews we reluctantly selected the Holiday Inn in the Historic District simply because of it's location (within walking distance to everything within the Historic District). We had booked a Standard Double Room which included a free Breakfast in the Hotel Restaurant.
Upon arrival, we were pleasantly surprised with the ease of parking, the cleanliness of the Lobby and the size and cleanliness of the room (I have avoided Holiday Inn Hotels the past several years because of their poor and seemingly declining quality). 
As we had hoped, everything we had planned to see was within walking distance and the hotel Concierge (or Doorman; not sure which one he was) was very helpful in providing recommendations and directions to activities and restaurants. In fact, they were very honest about where to go and where not to go as well; quite useful recommendations!
Our only negative experience was with the hotel's restaurant. When we arrived for breakfast, there were many, many patrons waiting to be seated and many empty dirty tables waiting to be cleaned. If someone was in charge (i.e. Restaurant Manager, Hostess, etc...) then it was not obvious to anyone and most of the guests were frustrated. When I spoke to a staff member about the situation she expressed that this was not her job as she was only a waitress and she was too busy to help us. After about a 30 minute wait (we shouldn't have waited) we were seated and offered what was supposed to be a Breakfast Buffet. This was hands down the dirtiest, unappetizing buffet that my wife and I have ever experienced (and we have lived and traveled throughout Asia, etc...). 
The biggest surprise however, came when we received a bill for the breakfast. First, the charge was ~$15.00 per person for this horrible breakfast (McDonalds is far superior). Second, when I explained to the man who delivered the bill that breakfast was included in our reservation he explained that they changed their policy and that the front desk had been forgetting to tell people this when they check-in. He explained that the new policy would only cover a portion of one breakfast and that's it. 
So, I got up and waited in line to speak to someone at the front desk about this. While I was in line the man who had delivered the bill came and asked me to come back and he would comp the whole thing instead of having me speak to the front desk. This seems very odd but my wife and I did end-up with breakfast included. I shared the story with the young man working the front desk and he said he had no idea what the restaurant was talking about (he didn't seem overly concerned) but that we would not be charged for breakfast.
Bottom line, this hotel is clean and the location is superb if you are a tourist hoping to see the historic sites of Philadelphia. We would definitely stay here again but would never consume any food prepared or sold on the premises!