Mia's Nails is a trendy little salon, near Covent garden/Shaftesbury avenue. It's well kept and and the staff are professional and helpful. I got a regular manicure and pedicure in my lunch hour. If you're in a rush, the salon does get very busy from 1-2, so I'd recommend going earlier or later.
Overall I'm very happy with my nails, would definitely recommend!