Contact Us It’s easy to book Atrium Boutique Hotel online. If you need to ask something, send your message in the form below and a member of our team will help you. 24, George Washington Str., Sofia City Centre reception@atrium-sofia.com +359 878 54 53 40 Got a question? Anything you ask, no matter how small, will make a big difference in helping us. Send a message and we will reply your inquiry within one working day. Guest relations’ business hours for phone calls are 9:00 – 18:00 EET, Monday to Friday.Check-in and check-out reception is 24/7. Send your message here Message Name Email Send