Sale is one of the oldest cities in Morocco. It's a neighbor city of Rabat. both are only divided by Bouregreg river.
There's a huge project called Bouregreg going on and should be finished by March this year. It will be an excellent asset for the tourists and the city.
Agence pour l'Aménagement de la Vallée du Bouregreg (AAVB) | Aménagement de la Vallée du Bouregreg | Bouregreg.com -- The official project website, it's in french but google translate will do the job!
There's few ghetto neighborhoods in Sale but nothing really scary like in Miami or Detroit