Great place! We stayed with our 2 daughters (18, 21) and it worked wonderfully. Stocked up on food, etc. and able to take care of most meals on our own. Washer/dryer in the unit, so very convenient to take care of towels - you'll use a lot of these! - and clothes. TIP: each building has its own pool, and just outside the entrance is a shower and foot spigot - when you come back from the beach, it's nice to rinse off here and shake out your towels, so you don't have any sand mess in the unit. Pool is good for laying out, soaking - little kids will enjoy it - small (we actually didn't use it with all the beach time).
Check-in is super easy - stop at the office or security office if they're closed (both building 1, near entrance), and then you have your door code. Elevator is right near the unit, so 4th floor is no big deal - actually a bonus - see below.
We were there in August, so peak heat/humidity. The AC in the living room does just fine. Mornings/Evening - and during sleep - we just left the deck door/window open (screen) and ran fans. The 4th floor gets some nice breezes and great views! Enjoyed breakfast and reading on the deck with table. Coffee maker and filters there, just get coffee!
The closest beach - Charlie Beach - is about 3-4 minutes walk - literally. Go left out the complex, cross at the marked cross walk straight ahead across the road and you'll see the shower/entrance/steps at the end of the road. Some shade trees, but bring the supplied umbrella - skip the umbrella in the afternoon - winds really kick up until closer to sundown. Chairs are also supplied - really nice.
Charlie Beach is a really gentle, sandy beach - good for little ones. Pretty good snorkeling as well - we saw several turtles. Once on beach, swim to the right where you see rocks - they like to hang out there. When windy, sand gets kicked up and affects visibility some.
Lots of stores (Foodland, Safeway), restaurants in the area. Kihei Cafe is really good, Lava Java coffee, Nalu restaurant, Maui Bread Company; Boss Frogs water stuff/bikes (I recommend them as there are many stores on the island for pickup/dropoff). Several blocks walk to most things. Driving is fine also as parking is not a big deal in Kihei - it doesn't have the congestion of Lahaina.
Fairly central location to the whole island. 25 min. to airport; 25 min. to Lahaina; 2.5 hrs to Haleakala; exploring West/North side is a day trip (went as far as Olivine Pools and back-tracked). We did not do Road to Hana.