Mike I was there last year with Maluku Divers. You are probably using Archipelago's Adventurer II. John "Buck" Randolph who runs Archipelago also runs Maluku Divers in Ambon (not to be mistaken for Kurt's operation in Pulau Saparua). Best to get the most up to date info from him. I was also there in April on another liveaboard and I think PP was there too.
As for the ops itself, pretty basic operation with clean but spartan rooms with only 1 room that has hot water and ensuite bathroom. Others are shared everything. Food was ok and the guides were good. Service overall was very good and the locals are very eager to please. My trip was a bit of a fiasco with the dive company organizing a trip to a place they hadn't gone before and they showed purdy brochures and website. Many guests were sort of shocked at the reality, especially since they paid full rate and the resort was offering major discounts to the organizer. Anyhow just expect spartan and basic and you'll be fine. The ops is about 45 mins car ride from the airport (brand new Dutch sponsored airport, where many things like gate lifts aren't working, neither is the a/c or do they give you trolleys. Make sure the Maluku guys (Joseph(if I remember correctly) is the local travel rep for most of the dive ops, I see him everytime a dive group comes in for different boats) arrange to meet you as you have to report with passport/visa to the local police for registration. Not something you want to do yourself unless you speak Bahasa. I did that last year and it was not fun.
I urge you not to look at the hotels in town. The trip is about 20-25 mins and really unnecessary. It's quieter at the resort and clean enough. If you must go to town for some fun, there is this disco called moon something which was pretty fun.
As for the diving, the best sites are Pintu Kota (hard to dive because it has to be done at the right time or it's a flyby current dive BUT amazing coral growth and even pelagics sometimes), Twilight Zone (Laha) (legendary muck site since the 90s, gone down a lot but still great), the Caves (pretty site with swim through). There are also some awesome sites on the smaller islands. The wreck is also pretty fun.
The dive guides are competent and good for critter spotting. One of the guide's brother is the legendary Tommy from the 7seas and the great eyes is apparently hereditary.
For the uninitiated, what you'll find is marine biodiversity, often subtle. Eg, scorpionfish you'll see are maybe 12 different species in one dive, with subtle variations. Their ID books weren't the best so it'd be wise to bring your own.
Hope this helps.