Here are suggested travel options from Barcelona Airport to the the meeting venue at the Universitat Autònoma de Barcelona's Casa Convalescència, C/ Sant Antoni Maria Claret 171, 08041 Barcelona. The Hotel Amrey Sant Pau where many of the attendees will be staying is directly across the street.

From the Airport take the Aerobus: http://www.aerobusbcn.com/index.php/en.html which stops at Plaça Catalunya. Then there are several options: 
1.- Metro Line 4 (yelow) from Urquinaona to Guinardó - Hospital de Sant Pau (stations)
2.- Metro Line 3 (green) from Catalunya to Diagonal then Line 5 (blue) from Diagonal to Hospital de Sant Pau (stations)
3.- Buses lines 47 or  45 from nearby Plaça Catalunya to Indústria/Hospital Dos de Maig (step down)
Total time about 1 hour and cost about 8 Euro*

Taxi. This costs about 35 Euro* and takes around 30 minutes to the destination

Other options for getting to the venue are available on the Casa Convalescència website.

*Travel costs are estimates.