We stayed a villa Dona Lisa, end August/early September. A good time to go: weather still great but not over powering heat, and perhaps not quite as busy as mid summer.
The villa is excellent, clean, modern (as in decor and furnishings, shower, kitchen etc), and spacious, making for a very practical but comfortable stay. We enjoyed the separate BBQ area and the pool is completely secluded from neighbouring properties.
The location is excellent, giving excellent links to Porto Vecchio and Bonifacio. It was also convenient for accessing the mountains behind the Villa (Ospedale). Some lovely walks, once we had located a decent map! If you like walking and are staying here, I would recommend you research walks before you leave.
The beaches are just excellent, several not too far away, but our favourite was Santa Giulia, crystal clear waters whitch kept our 17 year old son very busy with snorkelling. If you have small children, this is a very safe beach.
Our airport for Corsica was Bastia, we thought that getting the return flight might make for a stressful drive, 8am check-in). In fact the roads were largely empty with a 5.45 departure from the villa. Pleasant drive in the end.
To conclude, if you stay a Dona Lisa, you will not be disappointed!