Hey Partha, I was in Raja Ampat in January. I was in the same boat as you, hard to find any solid, reliable information about homestays on the internet or anywhere. I was checking weather conditions regularly for months, surely it couldn't be overcast and raining everyday. So I decided to go on a scouting trip to really see what it was like.
I decided on Kri Island as I read that it was a good location, close to good dive sites. And also that it had reliable 3-4G signal. I made contact with a couple of homestays off Google maps, 1 replied that they had available rooms. But when I turned up on the island, they actually didn't have a room. So I walked up a couple of hundred metres to another homestay called "Mambetron". They lady there was very nice and spoke good English, they had rooms. There were people of all ages and nationalities staying there, and 3 meals a day is included in room price, room price was 300k rupiah I think. It was also situated directly next door to another homestay which was actually a dive centre as well, "Delvin Homestay".
I actually moved to Delvin the next day as they had more available rooms, and I got a bungalow on the water for 300k a night with 3 meals. The phone signal at both homestays were good.
Delvin dive centre were actually pretty good, the boat was in excellent condition & modern. The diving gear was great, I actually brought my own gear except for BCD, their BCD was a brand spanking new scubapro.
Almost the entire boat and diving crew were from Manado and were competent and experienced. I dove for 2 days, the weather was great, all sunshine with a few minutes of light rain.
The sites we dived was Blue magic, Cape Kri, Yenbuba Pier, Chicken reef and I forget the other site. Dives are between 500-550k rupiah depending how many dives you do or if you got your own gear.
The owner of Delvin homestay speaks good enough English, but calling him directly or by SMS is better to get a hold of him.
As things can change, they weren't exactly established when I was there, prices could be different?
All in all, Delvin would be my preferred diving setup when I return. Also they knew some of my diving acquaintances from Bali.
Hope this is of some help to you
