I booked this activity twice. During my first visit, the weather wasn’t good so the rooftop was closed. Thankfully, they offered a full refund with no hassle. On my second booking, the weather was perfect and the rooftop was open—the view from Shibuya Sky was absolutely stunning, one of the best in Tokyo!
I highly recommend buying your tickets through Klook to skip the long lines and avoid missing out, as tickets can sell out quickly.