Don't let the negative reviews deter you from booking this space. It's a hidden gem right in the middle of Waikiki, and it's perfect. I stayed in unit #3 and I really enjoyed it. The bed was huge and comfortable with plenty of pillows. It was a nicer space than I expected after reading some reviews. Very clean, no bugs, everything in working condition. The AC was amazing. It was a liiiiitle pricey for the full month, but I was very happy with the space, the location, and David as a host. I would definitely stay here again.
You can walk to the beach in less than five minutes. Kaimana Beach is also close by, which I recommend if you want something non-touristy. Ala Moana mall is close as well. Pretty much everything you need is within walking distance. I had a car and the parking was very convenient (although, unit #3's space is under a mango tree, so just be aware that you will likely have some mango splatter on your car when they fall out of the tree. No damage or anything like that, just needed to wash my car a little more often. If the other units' tenants don't have cars, you might be able to ask about getting a parking spot not under the mango tree.)
Waikiki in general has a lot of police activity because it's a busy city, and it's not uncommon to see homeless people. I lived in DC for six years so this did not bother me and I never felt unsafe at this location. I found the neighbors in the nearby separate apartment complexes to be very friendly - one of them invited me to a volunteering event where I ended up making some good friends. All in all, was a great stay and I highly recommend.