We went to Kona with our 3 year old and 7 month old toddler. Location is awesome with this condo. It is so close to the main parts of town. Being able to swing by to put food in the fridge means no food is wasted. Laundry and dryer on site is great especially in the hot humid weather. As mentioned, you do have to hike up stairs to get to the condo, which took some getting used to especially with our two little ones. We were here for a destination wedding, so we decided to kill time at the pool in the morning. We had the whole pool and hot tub to ourselves.
As for the facility, it's actually really private. I think the only time neighbors can see you is if you walk out to the balcony. We didn't any issues with noise or surrounding neighbors. Beds are very comfy (not those annoying cheap springy beds). My only "complaints" were: I thought the shower head downstairs was too weak and no curtains to hide the sunrise if you sleep up on the loft, but those are definitely personal preferences.
Host is extremely responsive. Mahalo, Erica!