cl.cam.ac.uk
My office is in the University Computer Laboratory "William Gates building". This is about 1.5 miles from the centre of Cambridge, and 3 miles from Cambridge railway station. Directions and a local street map are available as a single page PDF file.
If you are coming by bicycle, I recommend that you avoid cycling on the Madingley Road, which is a busy traffic route with inadequate provisions for cycle safety. The bicycle route along the "Coton Cycle Path" is safer, far more pleasant, and worth researching. From central Cambridge, this passes along Garret Hostel Lane, Burrell's Walk, Adams Road, onto the Coton footpath, then Clerk Maxwell Road and left onto a brand new cycle path. The university provides an online map that can be used to plan this route. The Computer Lab is building number 27 on this map. The brand new cycle path from Clerk Maxwell Road appears as a red triangle to the left of that road, then a white lane, then a dot-dash green line. All of these are now paved and safe.
Potential source of confusion: the William Gates Building is NOT the location of Microsoft Research Cambridge (building 74 on the map). The Computer Laboratory appears to be in front of the Microsoft Laboratory (physically). Potential landmark: The University Physics department, usually called the Cavendish Laboratory, is just beyond the Computer Laboratory. The Cavendish is better known to taxi drivers, as is the University Veterinary School, on another part of the West Cambridge campus.
Visitors from outside the department should ask for me at the reception desk immediately inside the front door. If you are a local, and allowed to walk around the building by yourself, my office number is SS04. SS means Second (top) floor South wing, as shown on this map.