He is referring to Coconut Bay condos - just north of Macabuca. I've stayed with Duncan many times. Good guy and Shaggy and Paul who help run the dive op are equally as good. Condos are very spacious, clean, and of course good access to shore diving. I think this place is one of the hidden gems on the island.
The dive platform over there has improved quite a bit since I started staying there. There are now showers, rinse tanks, and a wooden walkway to the iron shore. It seems like they're adding more and more each time. Plenty of tanks and weights are always available and ready to use any time of day.
Really, the only downsides of staying there are 1) distance from Georgetown/SMB (may be considered a good thing), and 2) being on the northwest corner, the area is prone to current. But, when it's good, it's REALLY good - better than Turtle Reef.
As far as his dive op (Stingray Watersports), he has several boats, but I've only dived from his Newton 46. Very spacious boat, plenty of room to spread out. Leaving from Morgan's Harbor for the north wall (when it's the season), it's a very quick ride to the wall. Otherwise, he'll leave from West Bay dock.
Don't know if it's just my groups, but I will say that if you expect hand-holding and valet diving, this isn't it. You will be expected to setup your own gear, switch tanks, etc. Some may find this to be annoying, others (myself included) don't mind at all. In fact, if you're the anal-retentive type, you'll probably prefer this.
If you want a guided dive, stick with the group. If you're experienced and want to do your own thing, they'll allow that as well. Really the best attitude to have as a dive op IMO.
One nice thing about them - they meet and leave from the dock promptly at 9 (not 730 like other ops). Kind of nice to eat a leisurely breakfast, get ready, and then head over.
Have fun!