The result was based on a survey of over 27,000 international city dwellers.

https://www.timeout.com/newyork/news/chelsea-was-named-one-of-the-top-10-coolest-neighborhoods-in-the-world-100621?cid=email~emailname%3DNEW%20YORK%20EN_NEWSLETTER_20211007~jobid%3DDM10389~crmid%3Dae90e058-375f-458b-97b6-8c2fa1697e50&deliveryName=DM10389