If you like romantic little beach huts which are comfortable and simple but not overly basic then you'll like Baan Panburi.

Personally I imagine basic to be just a hut with no bathroom, no fan and a thin bed. The other reviewer sounds like she may have been more comfortable on the more touristy island of Ko Samui.

The beach at Thong Nai Pan Noi is beautiful and great for swimming, and very chilled out as it's only accessible by 4WD or boat.

Days can be spent relaxing on the beach, swimming in the lovely waters, snorkelling or visiting local waterfalls, reading a book in a hammock slung from the porch of your beach hut, eating a tasty barbeque of freshly caught seafood at one of several restaurants within easy walking distance, then strolling down to a bar with a beach bonfire until the early hours.

Baan Panburi is highly recommended, though if they tell you they are full and you can only stay one night, do it, because they invariably let you stay longer.

We stayed at Baan Panburi Resort during "off" season in September 2005. Not only did the entire island seem a bit deserted but so did the resort which kind of suited us as the resort borders a beautiful beach -and you kinda have it more or less all to yourself (except that you are sharing it with resident street dogs as well) The resort itself is on the ok side but it has many "basic" things lacking. The bungalow we stayed in was small but that's fine as you don't spend too much time in it. The mosquito netting was dirty and you felt like you were suffocating under it, so we never used it but burned mosquito coils instead although you are not supposed to! The fan was too noisy to keep on at night. The room never got serviced during our 5 day stay, although you are supposed to get new bedding and "a new towel" every 3 days - the "ensuite" bathroom is very rudimentary - you have to flush toilet by pouring water from a bucket, and the shower consisted of something slightly more sophisticated than a hose. The resort's restaurant was decent but the menu gets boring quickly as you end up eating pretty much all your meals there. Yet, we suspect that my husband might have gotten food poisoning from fish he ate there one night. Staff in general was friendly (except the manager who knew nothing about hospitality) ... etc.. etc... So, if you are looking for a romantic hideaway with all the mod cons this is not the place to go but if you are on a backpacking trip like us and your expectations are not too high - this place is a good deal as overall it is cleanish and has beautiful surroundings. I mean, we only paid about $10/head/night so you can't argue with that!
(Plus, there was talk of management change when we were there so things might improve overtime)