My friend and I stayed 9 nights in Mike's apartment and found the location to be great with Causeway Bay MTR around the corner, as well as many shops, restaurants and amenities nearby. Mike wasn't around but he was available via Airbnb message to answer our questions, and was generally prompt in replying. Before our arrival, he sent us a comprehensive list of guidelines along with instructions for checking in and out. He was easy-going and accommodated our requests for extra towels and blankets. We also appreciated his help on how to use the washing machine.
While our stay was fine, we felt there were some areas for improvement. The place is rather run-down and very dusty, which caused our skin to itch, even after showering. The washing machine is imbalanced and needs to be propped up on one corner with the floor cleaning wiper. It also shook violently and made a lot of noise during the washing cycle. I'd suggest washing your clothes at a laundromat if you're staying for a longer period. Also, the television was at an odd height and we developed an ache after awhile. It gets noisy sometimes with rowdy patrons from the bar opposite. There was one night where the noise went on until 5am, so light sleepers might want to take note. And as many people have mentioned, the several flights of stairs are a pain if you're lugging heavy suitcases. For the location and price (we had a weekly discount), the apartment was satisfactory but could have been more pleasant and comfortable.