Philadelphia is where Sylas called home, after moving there from the middle of nowhere Kansas. He moved to Philadelphia to be closer to major research facilities, academia, and hospitals, where he could better study Sources of supernatural phenomena.
Sylas lives in a well-furnished, but not extravagent 2-bedroom apartment. One bedroom is dedicated to sleep and company, and the other is a dedicated workspace for his study into the supernatural. A wealth of books line the shelves, a whiteboard laying out the connections beteween different Illuminations and creatures.
He has a fairly big living room and an up-to-date kitchen that is fully furnished. Hardwood floors with some carpet. No pets allowed, sadly.