Relaxed, friendly and clean environment. Knowledgeable staff who remember you between visits and did not bombard me will a million and one questions. A good cup of tea, however, some more male-focused reading material when waiting would be good.
I've previously had a good experience here but this time the hairdresser tried to overcharge me (I had previously paid and she wanted to charge me a further £10) and did not wash my hair properly.