VENUE:
The conference will take place at the Headquarters of the Bulgarian Academy of Sciences
Address: ul. "15 noemvri" 1, 1000 Sofia Center, Sofia
(GPS: 42°41'40.5"N 23°19'55.7"E, or 42.694581, 23.332150)
 HOTELS: 
We suggest you look for hotels/apartments/guest house on either tripadvisor.com or booking.com. There are plenty of options in the city centre. We recommend you check the ratings before you book a place.
TRANSPORTATION:
 By car:
If you are arriving by car, you need to know that Sofia city centre is a short term paid parking zone and you need to make sure your hotel provides parking. More information about the centre parking zones you can find here: https://www.sofiatraffic.bg/en/parking/pochasovo-plateno-parkirane/p/1 
AND https://www.sofiatraffic.bg/en/mobile-apps  for the mobile Zone-paid parking apps
 Public transport:
Prices for public transport tickets/cards in Sofia:
- Single ticket: 1.60 leva (BGN)
 - Bundle of 10 single tickets for above ground transport: 12 leva
 - Electronic card for 10 single trips with the Metro: 12 leva
 - One day pass for all public transport: 4 leva
 - Normal three-day pass for all lines: 10 leva
 - Three-day Sofia electronic pass with options for discounts at some tourist and retail places: 20 leva
 
Ticket info - https://www.metrosofia.com/en/tickets
DIRECTION:
 to/from the airport:
How to get to and from the airport to the city centre : https://www.sofia-airport.bg/en/passengers/and-airport
 central train/bus station:
The central bus and train stations in Sofia are right next to each other.
Bus stops:
Central Train Station Square, Bus 60
Central Train Station Square, Bus 78, 85, 213, 214, 305, 313, 404, 413
Tram stops:
Central Train Station Square, Tram 3, 9
Kozloduy Street, Tram 1, 7
Central Train Station Square, Tram 1, 3, 6, 7, 9
 Taxi:
There are taxi stands at the airport, bus and train stations. The licensed company is OK Supertrans. You should be careful, because there are also companies/private taxis with exorbitant  prices. We can recommend the following companies:
https://www.oktaxi.net/en 
https://www.yellow333.com/en/
http://1euro.bg/   (phone number: 1 80 700)
https://91263.bg/?p=101&l=2