SPOILER ALERT: Dinna read unless you have read the first 4 pages of Chapter 87 in AN ECHO IN THE BONE.
I beg you to pipe down about Philadelphia, my friend. As my mother Patsy says: "Better than you has lived in Philadelphia." Let me tell you a little something about this city (which is really just a big town full of neighborhoods) that you call "grubby and unwelcoming". I had the pleasure of visiting most major cities in the great United States of America when I was working before I had my children... and Philadelphia is at the top of the "welcoming" list. The people are friendly; but not fake. They'll help you out if you need directions to the best cheesesteak place (Mama's in Bala Cynwyd, just outside the city, shhhh that's a really well-kept secret) and give you a smile while doing it. They will be nice as pie to you (unless you're wearing a New York sports jersey) no matter where you are: the Northeast... South Philly... the Western burbs... Rittenhouse square.. Kensington... Society Hill... doesna matter; Philadelphians are good people and do not all live in row homes with "yards full of rubbish".
Next time you're there in the 20th century, please do stop into the Dickens Inn (which is now actually called "The Dark Horse Pub") whose building was erected in 1788. You will get a tremendous feel for the true magic and wonder of Philly - and a lovely plate of bangers and mash to warm your wame. Also make sure to visit Boathouse Row... or visit the truly beautiful works at the Philadelphia Museum of Art... or the dinosaur bones at the Academy of Natural Sciences... or the truly amazing inventions at the Franklin Institute.
I thank ye... your humble servant,
PS: Please dinna rank on New Jersey either, as my spiel is even worse for that lovely state... which has been made into a laughing stock by the likes of The Situation and Carmella Soprano.