Not too surprising you didn't get a response to emails. MANY MANY Spaniards are only now coming back from a monthlong vacation/holiday so if the owner returned recently (s)he likely has hundreds of emails to go through before getting to yours. Other Spaniards take vacations in September because August may be a peak month for them.

Remember, you'll find dozens and dozens of Barcelona apartments on the Barcelona Apartments page here on MadridMan.com.

Saludos, MadridMan