Recommendations for accommodation

We are planning to go to Tonga for a honeymoon and are looking for a nice place, not to luxurious but with some comfort. Of course we would like to see the Humpback whales. Any recommendations?
Some must sees in Tonga? Thanks in advance!

The Tongan Beach Resort might suit.

Some info here:

https://www.lonelyplanet.com/thorntree/forums/australasia-pacific-pacific-islands-papua-new-guinea/tonga/tonga-lp-update-from-lp-s-south-pacific-edition-2012

and also on Tripadvisor

I myself stayed at an English guy's guesthouse who picked me up from the airport and sold me a good city tour together with accommodation. Forgot his name but can try to find it, if you still need it.

I've found his name here

https://www.lonelyplanet.com/thorntree/forums/australasia-pacific-pacific-islands-papua-new-guinea/tonga/going-to-tonga-in-october-advice-please

which led me to here

www.tonisguesthouse.com/