We stayed (party of 3) at Sonia's condo in Kihei for 5 nights and it was amazing.
It is ideally situated, removed from the more busy parts of Kihei so that you can enjoy the lanai in peace, yet close enough to walk to many beaches or shops. The building also has only 2 floors, which I prefer because it gives the unit a more cozy feeling.
The check-in process with Sonia was very simple (best in all my airbnb experience) and the parking very convenient (just in front of the condo).
The unit was very well decorated, and the kitchen was perfectly stocked.
I'd also recommend the huli huli chicken that is being sold wednesday (10$ half a chicken) on the roadside 10 minutes from the condo.
I would recommend this condo to anyone visiting Maui without any hesitations.