If you are looking for fully equipped serviced offices that are close to convenient transport links into and out of London, then Fitzrovia is a good choice.
Fitzrovia has several underground stations nearby, making it easy to reach other London neighbourhoods. Goodge Street tube station is the most centrally located station, which gives easy access to the Northern line.
Warren Street and Great Portland Street stations sit in the north of the area, so if you need to travel for your work you can reach the Circle, Hammersmith & City, Metropolitan, Northern and Victoria lines.
All the main London rail stations are all within easy reach, with Euston station being the nearest. There are a lot of regular bus services running through Fitzrovia leading to other parts of London.