I have been to this place one afternoon for a gel manicure sure that I couldn't get it without appointment, but I've been really lucky instead. The nice lady welcomed me and she asked me what kind of treatment I wanted to do, I finally went for the gel OPI.
The place was gorgeous, clean and simple.
The staff was great even If I didn't stay long, good service and area location close to tube Gloucester and South Kensington.
Totally recommend it and sure I'll go back for other treatments.