Last month my partner and I spent a week on Koh Lanta at Kantiang Bay View Resort and found the staff, in particular the management, to be unfriendly, difficult and rude.
When we arrived at the resort after a long journey from Australia we were 'greeted' by a member of staff who was seemed particularly put out by our arrival and that we had booked one of their cheaply priced bamboo huts and was only interested in trying to persuade us to upgrade to another room.
Throughout our stay we were only made to feel welcome by a couple of the staff and on the whole felt really uncomfortable. When we asked for fresh towels or toilet rolls (because the room was not cleaned once during our stay) we were made to feel that we had really put the staff out and was suprised that we were not charged extra!
We pre-booked an air conditioned bus through the resort which was to take us to the airport on our last day...only to find that the a resort management had kept our money and got one of the staff to drive us instead in an open top truck. The driver subsequently dropped us off at the ferry port instead of the airport and we then had to pay extra for a taxi the other end. When we spoke to the management both on the telephone and in person to complain they ended up shouting at us and refusing to give us our money back or help at all.
When we arrived in Thailand we paid 2200 baht to be picked up from Krabi airport and dropped at the resort. Again, a member of staff picked us up in the truck and we later found out that the resort offers a free pick up service from the pier at Ban San Lanta to all customers...so ultimately it cost us £35 to be driven from the airport to the pier...not sure that petrol in Thailand is that expensive!
However, the bay is beautiful, the rooms are good value and the food is adequate which meant we decided to stay for the duration.
A great island, but not a resort we would recommend in a hurry. The website says 'A warm welcome greets you' and this could not be further from the truth.

We stayed in the Kantiang Bay View Resort and paid Baht 2200 per night (no breakfast) for a so-called “beachfront cottage” which in fact was far away from the beach and the only panorama was the massage hut...
The once beautiful Kantiang Bay is ruined by the huge Pimalay Resort and their long ‘plastic’ boatjettie.
Kantiang Bay View Resort was one Big disappointment, everything there is wrong: Unfriendly uninterested – underpaid - staff and an arrogant manager, NO room service, a housecat sleeping (!) on the fresh bread, too loud music from the beach bar and bad food and so on. With other words a NO GO PLACE

Ao Kantiang (Kantiang Bay) has a gently curving white sand beach about a mile long with a few midrange hotels on it. It is on the whole quiet and low key with no irritating jetskis. The Kantiang Bay View Resort is at the Northern end of the beach and comprises chiefly of detached bungalows set in its grounds. Unfortunately they are really crammed together so there is no sense of space. The rooms are of good size but have no tv (hurrah!) and cold water shower - I think there was a hot tap but it didn't seem to work (not that you need hot water on Ko Lanta anyway). We paid 1000B a night for room only which is about GBP15 or US$25 - I thought this was slightly overpriced but the place was nigh on full and had a good atmosphere. The "Why Not?" Restaurant and Bar is on the beach and serves pretty good and well priced Thai food - service is ok but a bit unenthusiastic. There are a couple of other places to eat if you want a change of scenery. The hotel will organise day snorkelling trips (800B including lunch) and elephant rides nearby. There is an outdoor massage area which was popular with the guests. Nearby there are two small shops for provisions. No transport unless you hire a bike or scooter. The endless Jack Johnson songs pumping out from 6pm till 2am got on our nerves but the bar is definately not a wild partying place; mellow-out beach music. Clientele mostly 25-40 looking for a relaxing time.