I practice from 335 City Road, London EC1V 1LJ, in Islington, which can easily be reached as follows:

By underground/tube:

Close to Angel and a ten minute walk from Old Street tube station, both of which are on the Northern Line.

By overground:

A ten-minute walk from Old Street overground; 20 minutes from Kings Cross St Pancras.

By bus:

The following buses pass the building or stop at Angel tube station:
Routes 4, 19, 30, 38, 43, 56, 73, 153, 205, 214, 243 & 274