Worst trip of my entire life. The hotel is hard to reach- a plane, two buses / trains / a €130 taxi, a hydrofoil then an irregular and rude shuttle from the port. The staff are unhelpful and disorganised. The first day of our arrival the tranquil 'spa' played host to a car rally, and the hotel's pool and restaurant facilities were full of noisy, brash Italians who revved their engines. The second day the pool area and restaurant played host to a wedding, with loud music and lots of children. The rooms are not remotely soundproof, you can hear every conversation or every closing door. The weather took a turn for the worse; lashing rain, rolling thunder and lightening. There were two power cuts and nothing to do. There is no 'cinema', no log fire, just a lobby playing awful Italian music on the tannoy. Admittedly the weather is not Therasia's fault; but not having any contingency plans is a nightmare. You are on an island so you really are stuck. The restaurant is rubbish; the breakfast was sparse, cold scrambled eggs and minimal fruit. They ran out of melon on day two, and whilst they have a broad selection of pastries the choice other than that was small. There is no bath in the room, even though we were in a 'deluxe sea view..'. The 'complimentary minibar' features three soft drinks: pepsi, pear juice and water. You can't charge your phone/ laptop without the key in the door, so you have to be in the room. There was no room service menu so whatever you could order was at the whim of whoever , if anyone, was in the kitchen. The manager was rude and unapproachable. There is no wifi in the rooms and very poor signal in the foyer. 
Some rays of hope lie in Roberto, a kind receptionist who seemed to take pity on me. There was also a very nice pool man and good waiter. Best part was managing to book an easyjet flight four days early, and being able to check out of our seven night 'holiday' before seven nights were up. However, catching the 0800 hydrofoil in a monsoon was pretty terrifying. 

There is no denying that this is a fantastic location, breath taking setting and beautiful hotel. But the service is average and considering that it brings down the hotel in ratings is a terrible thing.

There are smatterings of 5 star service to be fair.. But smatterings..

Just a few simple adjustments would elevate this hotel considerably.

No pool service and a pool boy that whistles at you to get your attention is not good enough.
Food limited and expensive.
Front desk try their best - that's the best I can say.

Such a shame.

My family and I stayed for three nights at the end of August. We got an excellent deal on two rooms (for four people). The hotel is in a somewhat remote area of Vulcano, called Vulcanello, so you either need a car or you can use the hotel's shuttle (we had a car though the hotel's shuttle will be just fine if you don't plan to travel too much around the islands). The upside is that you are away from all the touristy stuff.
The hotel's pool is superb with a great view of the southern tip of Lipari island. The rooms are simple but nicely appointed. Breakfast is amazing. We had once dinner at the hotel and it was superb food (if somewhat pricey). Overall I highly recommend it.

Stayed at this hotel whilst traveling with a friend and we have the following comments to make. The location is absolutely breathtaking with probably one of the most sensational views you would find anywhere in the world. The rooms are well appointed and spacious. However there are some basic flaws that need to be addressed for this hotel to match the quality of the location and provide value for money- rooms here are expensive.
- rooms require sound proofing. You can hear every corridor conversation, toilets flushing in upstairs rooms etc.
- the hotel desperately needs a concierge desk. The islands are stunningly beautiful but guests need to know what's on offer and how to get there. We found getting solid information from reception desk staff quite difficult.
-given the central focus of the hotel is it's stunning pool we were surprised there was no pool service. There is a pool bar, but you have jump up and serve yourself. Pool staff were friendly but looked terribly uncomfortable. They should not have to wear long black pants etc when working in 40 plus degree heat!
-someone needs to kill the dreadful 1980s Hilton hotel style live music blaring across the resort every night as the sun goes down. The sunsets are spectacular, but ruined by this tasteless and dated music on offer.
-food options are limited and wildly expensive.
-needs a gym
-it was impossible to get hold of an iron. If you wanted something pressed you had to send it out for cleaning- expensive, unnecessary and time consuming.
All up was very glad to have experienced this amazing place but we were frustrated by the above. Don't miss a boat trip around the island, dinner at Marizio's at Vulcano port, or lunch at Trattoria di Pina on the other side of the island