We recently came back from POR. Our first 9 night stay at that resort. I have nothing to compare it to in the 'moderate' category so take my input for what it's worth as we generally stay at the Wilderness or Poly.
The grounds were very well cared for and pleasant.
We stayed at Oak Manor (facing the pool). It was okay... nothing hugely fantastic or overtly bad about the room/building. Your 6 year old will probably enjoy the theme of the room. Our daughter got a kick out of it, but since she's now out of the princess mode, it seemed to be short lived for her.
Since the workers were not good about keeping the pool quiet as it's supposed to be at 10 pm, I would not choose the pool side again. We called on 3 separate nights to the main desk well after midnight each time as people were screaming to the top of their lungs as if it was mid-afternoon. It did quiet down fairly quickly after we called though, so that was nice.
Housekeeping was timely and sufficient. We don't spend much time in the room other than sleeping & getting ready so I'm not looking for much other than cleanliness and well stocked for towels, etc...
At least for us, the few front desk experiences we had were just 'okay', though the line moved slow since they only had 2-3 people working. I had a small confrontation with one of the workers there one early morning. Since she wasn't busy and asked me how she could help me, I asked her if she convert my remaining QS Points to Snacks. She kept telling me she could do it, but I could also do it when I purchased the snacks. I kept saying that since she told me she could, I would like her to do so but she kept resisting. After the 4th time she accommodated my request. A small thing, but annoying. That has never happened to me before on any Disney property.
Our room did not have any USB charging ports which sort of surprised me in this day and age, but for the life of me, I can't even recall if the Deluxe resorts do. So take it for what it's worth and it may not be relevant to you.
Oak Manor location was ideal (for us) to the food places where the food was plentiful and good (as has been our experience at the other resorts). It was also not too bad for Old Man Island and was a straight shot over a footbridge to the main bus stop - which after trying the others - was the most efficient for us to use.
The service in the Lounge could have been better, but since it was myself only, I dealt with it while my family had their fun at Old Man Island. I will say - one worker at the lounge (think her name was Christine) was incredible. The Bayou Wings are also amazing if you enjoy that kind of food.
The full service restaurant on site is great - food and service.
Overall, it was a pleasant stay and if it seems to be what you are after, I think you've made a decent choice. I'm not sure we would return, but then again, we've been spoiled rotten with the Poly and Wilderness so my opinion in that regards shouldn't sway you in any direction.