We are just back from a Maui stay, including a few days at Nina's place in Paia. We found her description to be very accurate, her responsiveness to be exceptionally good; and in general all things to be as expected. We really enjoyed the proximity to Paia town, feeling like locals and taking the short walk to Momma's beach and restaurant, and the proximity to upcountry.
Anyone considering Nina's should be aware that you will need transportation as mentioned because walking the main road to Paia can be trecherous. You should also be clear that her place is up on the third floor with no elevator if that is an issue. We found that the morning traffic to be something of an impact on our sleeping.
We are seasoned Maui travelers and loved the location for that part of the trip - it is excellent as a launch point to Hana or Haleaukala; or just for hanging out in Paia.
Mahalo Nina!