An article on 6ABC.com shows a surprising winner of "Best Philadelphia Hotel" on the Trip Advisor travel site:
Beating out the Four Seasons, The Rittenhouse, the Ritz, etc.. was the Sofitel on South 17th St. in Center City.
178 people have voted for the European-accented hotel on Trip Advisor, so it's a pretty unscientific survey.
And, judging from the comments, a little slap-dash:
One happy patron awarded five stars, writing from Melbourne, Australia:
We stayed at the Sofitel in Sept with our family and friends who'd come from around the globe for a Wedding. The hotel is in the French area of the city - although we didn't get a lot of time to explore...
Center City regulars might not realize there is a French quarter here (there's what, the hotel and a consul nearby?), but it thrives in the land of tourist web sites.