I stayed here for two months and loved it. Vince is a fantastic host, helpful and responsive when necessary. The location is unbeatable: across the street from Waikiki Beach, and walking distance to a (in my opinion) better beach, Queen’s Beach. Lots of stores, bars, and restaurants nearby. Like another reviewer says, if you want an active vacation, this is a great base for you with Diamond Head, walking/running route along Diamond Head Road, and Kapiolani Park all nearby. I used the gym in the building several times a week (ask host for the building website, which has a link to a spreadsheet where you sign up).
Washer/dryer in the unit is very convenient. The kitchen is nice and fully equipped; I cooked a lot while I stayed here. The one thing Waikiki lacks is a regular supermarket, so I got delivery from Safeway and Foodland Farms, which was convenient. With so many restaurants nearby, takeout is always easy if you don’t feel like cooking.
I recommend joining Zipcar before you arrive. There are three locations in Waikiki close to the building that have Zipcars for rent. I used the Aston Waikiki Beach Hotel and International Marketplace locations. I used Zipcars primarily to get to hiking trails; there are a lot of hiking trails within a 15-20 minute drive of the building. If you want to rent a car for a longer period of time, there are also traditional car rental places near the building in hotels. In addition to car rentals, there are a lot of buses that come through Waikiki, making it easy to get to Ala Moana, downtown Honolulu, and other parts of the city relatively easily.