The conference will be held in the 19th century Redl Palace that hosts Renyi Institute, in the very center of Budapest. Talks will be held in the main lecture hall. The whole building is wifi equipped.
Address: Realtanoda u. 13-15., Budapest, Hungary, H-1153. (web page)
Excerpts from Renyi Institute's Contact & Directions page.
A comfortable way of coming into town is to take an Airport Minibus, which will pick you up along with a few other passengers and take you to the address you indicate (the name of the hotel usually suffices). You may buy your minibus ticket right off in the baggage reclaim area or in the arrival hall. Taking a taxi costs around 7000 HUF from the airport to the Institute or the city center. If you leave the arrival hall, you will see a small brown kiosque with yellow sign "taxi". You are supposed to order a taxi there, by giving the address where you are going to. A taxi will arrive in a few minutes. You pay directly to the taxi driver, at the end of the trip, either with cash or by card. More information can be found here.
There are also regular (blue) buses (No. 200E and 100E) leaving every 30 minutes in case of the 100E (schedule), and every 8-15 minutes for the 200E (schedule). You can access these with regular Budapest bus tickets (350 HUF, from the driver: 450 HUF). The 100E takes you directly into the city center, while with the 200E you have to change to the underground line No 3. Both routes will take you within walking distance of your accommodation. You can buy tickets at the airport from the ticket machines. More information can be found here.
In Budapest, there is a great variety of public transport: underground (metro), buses, trams, even trolleys. For more information on schedules or night services see the page of BKV Rt. (Budapest Transport Ltd.) Please note that you are supposed to purchase your ticket in advance, and validate it as soon as you got on the vehicle or enter the underground station.