Bergerie de Petra Pinzuta (a small tourist hut) was in summer 2006 in very bad condition: windows broken, roof demaged - possibly by a storm recently. It is now abandoned. Also the dirt road leading there from Lozzi got worse: only accessable with a 4WD jeep. So you will have to park the car at Lozzi campground for sure, or use the place as a base camp.
There are actually two campsites just above Lozzi: Camping Monte Cinto and Camping L'Armone. But they are side by side. Both quite big, so you will find place there even in high season.