Here are some hotels that should fit every webmaster's budget - non of them further away than 5 minutes from the venue hotel:
HOTELS:
The 5***** event venue hotel:
http://www.hotelmiramarbarcelona.com - 10 minutes from the center of Barcelona. From 169-184 Euro
Your 5***** star option:
http://www.grandmarinahotel.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 160 Euro
Your 4**** star option:
http://www.tryp-apolo.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 120 Euro
Your 4**** star option:
http://www.hotelbarcelonauniversal.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 110 Euro
Your 4**** star option:
http://www.hotel-millennibarcelona.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 100 Euro
Your 3*** star option:
http://www.hespedia-delport.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 100 Euro
Your budget hotel:
http://www.hotelautohogarbarcelona.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 70 Euro
Your 2** hotel option:
http://www.hotelnuevotriunfo.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 60 Euro
HOSTALS:
Your 2** Hostal:
http://www.hostalbcnport.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 65 Euro.
Your hostal in the heart of Barcelona:
http://www.hostalabrevadero.com - 5 Minutes from the Event Hotel and 5 Minutes from the center of Barcelona. Around 40 Euro.