I stayed here in low season so expected the area to be as quiet as it proved to be. The hotel is an 8 minute walk from the pier, another 5 minutes on to the town, but walking back after 1800 you must clamber over rocks that jut out into the sea (so make sure you're still relatively sober!)
The staff were all helpful and pleasant, I had no problem with understanding them or them me. The food is good, quality and price, and the service was prompt - but throughout the majority of my stay the hotel was no more than half-full except for the three days around the full moon party. The hotel has the cheapest intenet service I found on Koh Phangan and was also one of the only ones from which i could access my Irish internet bank account. I'd booked one of the more expensive rooms with dvd player and fridge, which was situated on the corner, and was no better or worse than i'd imagined (having stayed on the island on 4 previous occasions). My only complaint is that they did not supply soap or shampoo which most hotels in this price bracket tend to.
While I doubt I would return to Vimarn Samut, the hotel was clean and the staff friendly. Yes, there was a cockroach in the bathroom but this IS South-east Asia, and I had to request that my bedding was changed but this was done promptly once requested.