British Airways baggage allowance query

[cannondale]

Just booked tickets to fly down to London City Airport with British Airways. It says on the confirmation that the baggage allowance is one piece of checked baggage and one piece of hand baggage. Is this per person or for both of us?

What's the best way to get to the Tower of London from the City Airport? Are there any good, cheap transfer services, or am I best just to get on a bus or DLR?

Any suggestions much appreicated.