ca.kayak.com is also available in French. Voir le site en français.
Travellers who like staying in Sarria-Sant Gervasi recommend InOut Hostel Barcelona, Wilson Boutique Hotel and Wow Hostel Barcelona.
KAYAK users have found double rooms in Sarria-Sant Gervasi for as cheap as C$ 46 in the last 3 days. The average price is C$ 60.