Great place to stay. Good location near the lagoon and also near to restaurants. The apartments are called Discovery Bay and this particular one is in Tower 2 called "Resolution".
You definitely can walk to Ala Moana and also to Waikiki, but we had a small child so chose to take taxis. All the taxis know the building.
The apartment had a small swimming pool and comes with a parking bay (which is really good when hiring a car). The car hire company called Alamo is also situated in the building, along with a MacDonalds, Subway, a sushi joint and a few other restaurants and shops.
The apartment itself is a little old, but well kept. As mentioned, the second room is open to the kitchen, but partitions are provided and works well. The furniture is a little old, but not too bad at all. Great views can be seen from the apartment (the Friday night fireworks can be seen really well)! Loved that there was a washing machine and dryer!
Mayu is a great host and communicated effectively and promptly.
Definitely recommend staying here!