Coming to Barcalona in September got some questions

I'm treating my Girlfriend for her birthday and want to stay as central as possible thats near everything if possible. What hotels would you say are ideal that are reasonable priced?

Also I want to visit the Camp Nou...Is it close to the main center?

thanks

Camp Nou is in Les Cortes. Not really central but not too far.

By central, I suppose you mean the area around Plaça de Catalunya? Camp Nou is easily accessed from there, you can take the Green L3 line to either Les Cortes, or Maria Cristina station. The trip takes about 25 minutes plus some walking.