Refer to the input text as context and select the correct relationship between 'apartment' and 'London' from the available options.
Options: location of formation, headquarters location, business division, operator

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