Very expensive city to travel to since British Pounds are not cheap. Love the vibe of the city; it has a lot of character (especially at Camden) and with all the street performers and museums you'll experience culture in a way you'll never forget. Very safe in general. Transport is expensive. Food can be cheap if bought from street markets but otherwise very expensive. Many interesting things to see, like the beautiful Royal Parks and museums, which are free to visit!
Insider Tip:Museums are free here, do pay a visit to a few of them! But be sure not to visit too many or you'll suffer from museum fatigue :O Visit the Camden Comedy Club!