DFR; I can recommend two schools, both of which I have a lot of experience with.
The first is in Florida; Cirrus Aviation at Sarasota. They have a Cessna fleet; 152s and 172s; also a Warrior and an Arrow. The instructors are superb, they really know their stuff, and put in a lot of effort. The owners (husband and wife) both work there full time, and are intimately involved in the running; I had a couple of problems with aircraft going tech, and both times they foxed it with free upgrades to the G1000, or free flights, they are very customer focused! I did my CPL and IR with them.
Cirrus Aviation
The second is in Camarillo, California; about an hour north of LA. They are called Channel Islands Aviation. I had a couple of days with them to get my complex and high performance endorsements, and then planned to take their 172RG away for 2 weeks; but it went tech! So, they instantly offered me a brand new C182 instead, at basically the same price; once again, incredible service. The instructors, again, were great, they have a big fleet which is very well maintained (we were just unlucky!), and it's family owned; again, the owners are intimately involved and always there to help sort things out if you need them. Their fleet is all Cessna.
Channel Islands Aviation - Flight Training, Aircraft Sales, Flights to the Channel Islands, FBO Channel Islands Aviation - Flight Training, Aircraft Sales, Flights to the Channel Islands, FBO
Let me know if you want any more info