We have booked the rooftop bar at the Loft Hostel, in central Reykjavik from 2000 - 2200. We hope to see you there :) It's located at the end of Reykjavík's main shopping street, Bankastræti 7,  and within 5 minutes walking distance from Hallgrímskirkja (the City Cathedral), the City Pond and Harpa Concert Hall.