Buses, bicycles and punting on the Cam: huge fun when you’re in the heart of it all. Enter the Great Gate Tower of Christ’s College to be wooed by tranquil, beautiful quadrangle gardens, breakfasts beneath portraits of hallowed masters, and a serene chapel. At smaller Sidney Sussex – 1598-old with additions – you can play tennis in gorgeous gardens, picnic on perfect lawns and start the day with rare-breed sausages. Churchill has a great gym, Downing has Quentin Blake paintings on the walls, St Catharine’s has a candlelit chapel. Bedrooms (some shared showers) and lounges are functional; well-informed porters are your first port of call.