Majestic Hair is the salon that I go to most often, as I work near Town Hall. Booking is really easy - I can normally get a slot when it suits and they have lots of hairdressers that are good at cutting guys hair. The head massages are great and the prices are very reasonable.
They are conveniently located 3 minutes from Town Hall.
My regular hairdresser was on vacation and a friend of mine used Majestic so I gave them a go. Nice place and it doubles as a hair product shop so it was all very reasonably priced.