What do I need to know before retiring in Thessaloniki?

"Learn some Greek before you arrive..although, more & more people speak English, it will be appreciated by your new neighbors.... The other thing I'd suggest is.. network.. find, join, meet, make friends,with people already here .. have some type of support network in place before arriving.. You may need it, when whatever your trying to get done.. is being handled in only the way that Greeks know how..! Good Luck.," remarked another expat who made the move to Thessaloniki, Greece.