Hi there
I have never dived with Tomia Dive Centre but I believe it is a well-run location. They do not have accommodation but can arrange this for you. I'm afraid I don't know what the accommodation is like. Take a look at their facebook page - this might give you more information.
More details and photos of Hoga Island Dive Resort can also be seen on their facebook page as well as their website (www.hogaislanddiveresort.com). Diving with them is perfectly safe and Geertje who organises the diving here has been doing this for over 10 years so knows the sites well. The diving is beautiful all year round but particularly during September, October and November when the winds calm down, almost stop, before switching from coming from the East to the West.
Things to do on Hoga when not diving: check the resort reference library, bird watching, walk around the island at low tide, visit the bajo sea nomad village of Sama Bahari (Sampela), visit Kaledupa Island and see local weavers, walk to the top of a hill to see the village of Sampela and Hoga Island from another perspective, snorkelling in Sombano brackish water lake, watch pencak silat (type of martial art) performances by local people. Get to know local people. It is a very friendly place.
What you could do is base yourself at Hoga Island Dive Resort and then do a day trip to Tomia Dive Centre (approx 2 hours there, 2 hours back) to see what it is like. If I have time to do this soon, I will let you know what I find. The resort can take you over to Kaledupa where you would take an ojek (motorbike) ride (approx 20 minutes) to the village of Peropa on the other side and from there take the ferry to Tomia (approx 1 hr).
Hope this helps. If you need more info, more quickly just sms the resort phone number: 62-852-4162-8287 or 62-853-9429-0576
I am at HIDR now till mid October so hope to see you soon.
All the best
Lindz