KuBu terms itself as a new city spa. However, it doesn't immediately stand out as you walk along Bell Street in Henley.

There isn't a plush door or window showing you what's in store. To pin point it, there's a simple sign above a front door, as you would have for a chiropodist or dentist.

So when I press the buzzer to be allowed in I wonder whether the term city spa' is going to live up to its name.

As I climb the staircase and enter the reception, I am not disappointed, it is as if I have shut out middle England and walked into the heart of Bali.

The large spacious reception area hasn't the clinical steel and white decor of so many spas these days, it is calm and serene with dark wood walnut flooring and 100-year-old Javanese teak wood furniture, large white boat sails are suspended in the ceiling as if they are floating, and soft classical music plays in the background.

I am greeted by Sasha Becejac, one of the partners of KuBu, he is wearing loose trousers and a loose top and has an air of serenity about him. A customer is just completing a transaction, and when she leaves I am the only person there. Sasha explains this is done intentionally.

"We stagger the appointments, so that our clients have the place to themselves," he says.

I have come to experience their Kubu signature ritual.

Sasha set up KuBu with his business partner Indonesian-born Eileen Soriton, who is a massage therapist specialising in Balinese spa rituals and was trained in the art of massage by Balinese guru, Dewa Andayani.

The pair came up with the idea of KuBu, a Balinese word meaning small hut, when they visited Eileen's family home in Indonesia. They were so impressed with the hospitality, etiquette and spirituality of the spa treatments and massages that were carried out there, they wanted to bring that experience in England.

Kubu is in a listed building. On one side of the reception area is a large airy room dedicated to yoga classes and on the other side is a relaxation room, where after slipping into a towelling dressing gown, I am encouraged to unwind on a lounger or the four-poster antique Javanese day bed before my treatment.

Joanna Franks, my therapist from New Zealand, greets me and takes me to one of the three treatment rooms. Here, again the room is just as much an experience as the treatment. Unlike the white sterile environment of most beauty rooms which are often small and poky, Sasha has designed the room to be large and airy, with a free-standing Victorian bath, an Indonesian massage bed in the centre of the room, and candles are placed all around. I feel I am walking into a luxurious private bedroom not a treatment room.

My Kubu signature ritual begins with an essential oil foot bath. I place my feet in a bowl of warm water with flower petals floating on top and Joanna massages my feet. This gives me time to chill out and appreciate my calm surroundings.

Then the ultimate pampering begins with a one-and-half hour KuBu traditional Balinese massage. All the masseuses have been chosen by Eileen for their experience in authentic Eastern massage, and all have at least seven years experience. Joanna massages away my knots in my tight shoulders and I just float away, dreaming of a deserted beach in Bali.

However the ritual doesn't stop there. At the end of my massage, I am left alone in the room to enjoy a leisurely soak in a flower petal milk bath with a glass of champagne and some freshly made KuBu chocolates.

How totally indulgent and totally heavenly.