Mrs. Selfish and I stayed here for 2 nights back in November. Some thoughts:

PROS
+ Great location - especially for the monorail
+ 500 yen for parking is pretty cheap
+ cheap coin op laundry on property - soap is included in the washer
+ decent breakfast spread
+ complimentary drink coupon for gold & diamond members

CONS
- kind of basic, but expected for cost

In short, for 9600 yen, it's a place to crash for the night. It was a good stay, but not a great stay. On the plus side it's a short walk from some decent eateries, and is really easy to get to from the airport.

Full review with pictures for anyone who's interested: http://theselfishyears.com/2014/01/1...ubletree-naha/