I stayed at one of the apartments at Mark's airbnb for 9 nights and had a great experience!
Everything was super convenient - the self check in, the equipment in the unit, the beach equipment we could have borrowed and of course - the perfect location!! The units are 3 minutes walking from the wonderfull waikiki beach, bars, restaurants, attractions and everything you might want!
The communication with Mark was also very convenient!
I would definitely recommend solo travelers as myself and couples Mark's units in Waikiki! Great worth!