We had a nice time staying at Saichi's, he was a great host and the place was well described. It is a basic room (like a hotel room), but the location is good, just on the outskirts of the very busy area of Waikiki, so it's nice to be close, but not so close that it's crazy!
The pool area is great, I wish we'd made use of the BBQ, but there's so much to do in Waikiki, we ran out of time!
Easy bus access and we used Lyft/uber occasionally too. Lyft was great to go to the airport, just $22 plus tips. Buses go from the airport too, but you can only take hand luggage onboard.
It's a 15min walk to Walmart, Walgreens and Ala Moana Centre and from there you can get the #55 bus to the famous north shore surf beaches and turtle beach (aka Laniakea beach). It's also a short walk to the E or A bus, which go to Waikele Outlet Mall (bus can take 1.5hours in traffic, but amazing shopping!). Buses are $2.50 and you can ask for a free transfer ticket to allow 2 transfers to use within approx 2 hours.
We rented ebikes from ebikeshawaii (30min walk away on Campbell Ave). We had a Groupon to make it a little cheaper, it was still quite expensive, but an incredible way to explore the area. We did a full day rental (10-17:45) and rode through Waikiki to Kahala beach and up Tantalus Lookout, among other places.
We had 7 nights on Oahu and it felt too short, there's so much to do and see! Pick up a cheap snorkel at Walmart or pay the same to rent one and make sure you get to Hanauma Bay reserve (#22 bus goes from across the road from Tiffany's in Waikiki). Best to go as close to opening as possible (more likely to see sea turtles that way, apparently). We arrived at 9am and it was starting to get fairly busy.
This has gotten far too long, so I'll leave it there! Thanks so much, Saichi!