By road
The best advice for any visitors wishing to drive into Hampstead is, don't. This is a largely residential area, and there is virtually no on-street parking available. Residents' only parking spaces are guarded very jealously. With the public transport links being very good, there is little need for any visitor to drive into the district.
If you do insist on driving, there is a public car park on the south eastern edge of Hampstead Heath accessed from East Heath Rd, and this is convenient for visiting the heath. The "easiest" the term must be used relatively as all routes are congested routes in from central London are:
A41 north from Marylebone Rd at Baker St. The A41 becomes Finchley Rd in this district.
A4200 Eversholt St north from Euston Station to Camden High St, and then the A502 which runs through the heart of the district as first Chalk Farm Rd, then Haverstock Hill and then Hampstead High St.
Coming from the north, the A41, A502 and A598 all connect to the district from the A406 North Circular Rd, and thus from the M1 motorway.
By bus
Finchley Rd is a major bus route through London. Bus numbers 13, 139 and 82 all originate in central London and pass along the length of Finchley Rd, allowing easy access to Swiss Cottage and West Hampstead.
Hampstead and Belsize Park are less well served, with the only direct connection from central London being bus number 46, originating at Farringdon St. However the 24 bus from Victoria via Trafalgar Square serves nearby Hampstead Heath and the nearby Royal Free Hospital.
Night bus N5 is an excellent and convenient way to get to Hampstead, Belsize Park and Golders Green, after a night out in the West End. Originating in Trafalgar Square, this service makes its way north through King's Cross and Camden Town, before travelling through the district along Chalk Farm Rd, Haverstock Hill, Hampstead High St and North End Way. Runs approximately every 15 minutes from just after midnight until 06:00.