Nice stay at the Four Seasons
Stayed one night at the Four Seasons. 
The hotel is located near the art museum. The location is ok depending on what you plan to do in Philly. For us, where our time revolved around Rittenhouse Square, it wasn't ideal. For a touris, it is likely fine.
The hotel is well maintained and the rooms are nice and clean and well maintained. The room was large and had a soft fluffy king bed. It had a small desk and sitting area, a flat screen tv and a mini bar. The bathroom was large and was the typical old-style Four Seasons with lots of marble and a normal tub/shower. The towels were huge and fluffy. Really no complaints at all on the room.
The service was ok at the hotel. The hotel was at full capacity and the staff seemed a bit overwhelmed. For instance, the valets were very busy and didn't open our car doors. The check in desk was overwhelmed and we had to wait to check in. 
Overall, it was a fine stay. If I were visting Philly and the location was good, I would consider the Four Seasons.