The center of London is frantic and fast-paced, so it is an absolute blessing that Marylebone exists. The high street, which runs parallel to Baker Street, has village-feel and is lined with small independent boutiques, gastro-pubs and cafes. It's like stepping into a different world after the chaos of Oxford Street, which is just minutes away.
Head north up the high street towards Regents Park and, if you're there in the autumn, make sure to stop off at Frieze Art Fair, a contemporary art fair housed in a purpose built temporary structure in the south of the park, with Frieze Masters on the north side of the park. One worries that the animals housed in Regent's Park Zoo might be a bit put off with all the art world animals in town but, saying that, the old timers are probably used to it as (the now defunct) Zoo Art Fair used to be staged within the zoo grounds itself.
Baker Street is still defined by Madame Tussaud's, which draws in the crowds with the its ever-changing rota of wax models of famous people, while around the corner the Sherlock Holmes Museum provides a literary escape into the world of Sir Arthur Conan Doyle's famous sleuth.