Take context from the input text and decide on the accurate relationship between 'apartment' and 'London' from the options provided.
Options: location of formation, headquarters location, operator, business division

From my notepad: one leg of Viking Star's maiden voyage May 12: Tube from north London apartment to Greenwich wharf (about 30 minutes from King's Cross) and board Viking Star for the five-day cruise from London to Bergen.
location of formation