I had an absolutely wonderful experience with Mula Mula! My hair feels fabulous. I'm so please with the treatment. I've had quite a few Keratin treatments in different cities -Valencia, Lisbon, Amsterdam... and 2 different salons in London since moving here & I will definitely be returning here for my treatments. She does not use formaldehyde (important to note bc a lot of places lie) and my hair is the smooth straight texture I like. So glad to have found this salon! Great job and trustworthy.