It is open to public?

Yes

Sure is

Yes, but not if you're there just for drinks.. limited space is for dinner area.

Yes, it's open to the public. You might find a concierge looking to guide you to the lift, but there seems to be no restrictions in admission. Reservations are advised, but not necessary if you are going just for drinks.

Yes it is, but reservations are a good idea.

Brilliant cocktails great vibe great atmosphere

Yes, it is! But is best if you do reservations