Swiss Cottage
Swiss Cottage is an area in the London Borough of Camden, England. It is centred on the junction of Avenue Road and Finchley Road and includes Swiss Cottage tube station. Swiss Cottage lies 3.25 miles (5.23 km) north-northwest of Charing Cross. The area was named after a public house in the centre of it, known as "Ye Olde Swiss Cottage".

Swiss Cottage is an area in the London Borough of Camden, England. It is centred on the junction of Avenue Road and Finchley Road and includes Swiss Cottage tube station. Swiss Cottage lies 3.25 miles (5.23 km) north-northwest of Charing Cross. The area was named after a public house in the centre of it, known as "Ye Olde Swiss Cottage".
Check the official site before travelling; hours and prices can change.
More markets

Borough Market
London's defining food market — go early Saturday, eat your way around the perimeter.

Columbia Road Flower Market
Sunday-only flower market in the East End — 8 a.m. for choice, 2 p.m. for prices.

Maltby Street Market
Borough's smaller, scruffier sibling — railway arches, weekend only.
Source: wiki-list