It depends on your budget really. I stayed at Hostal Girona about 3 years ago for about slightly less than 40 euros a night. I've got no idea how much it costs now but I'd imagine not much more than it cost back then. A couple of months ago I stayed at Sunotel Central (supposedly a 4 star hotel) for 80 euros a night. I'd recommend both of them. Another hotel that comes highly recommended (my friend and his missus have both stayed there)is the Hostal Constanza. If getting a good night's kip is important to you after your exertions at the festival stay well away from Las Ramblas as it gets quite noisy at night. Barcelona's a fantastic city and there's always decent bars within walking distance as long as you're not too far away from the centre. We happened on one such bar (L'Ascensor) a few years ago and had a cracking time in there with a couple of mates. I think there's also another bar called Ginger a minute's walk away which also had a good vibe. There's also loads of bars in the trendy Born area. If you're also looking for tapas bars, there's loads but there are 2 stand-out ones in my opinion: El Vaso de Oro in Barceloneta (best patatas bravas ever) and La Bodegueta in Eixample. Another very good tapas bar is Cerveseria Catalana (also in Eixample, I think). If you like art and architecture, you'll love Barcelona. There's loads of Gaudi works to see (La Pedrera, Sagrada Familia, Parc Guell etc) but there's also the Miro Foundation and MACBA which are also worth a visit. Placa Reial is also worth a visit as you can sit in one of its many bars sipping a Cruzcampo while watching the world go by. If I think of anything else, I'll let you know but I'm sure there's loads on here who've got other suggestions.