Renting a motorcycle

Hey folks! I'm visiting Barcelona currently and consider renting a bike to experience the roads here a bit.

I already have a European A (unlimited) license for a little under a year, so I don't think renting something in the 500-600 range should be a problem. I found a company called Hertz online, are they reliable?

Anything I should know or consider before trying this? I'm pretty much thinking I'll only rent it for a day and return it back on Saturday or even Friday evening. Just wanna ride around a bit as all the bikes around me are really making me itch for the two wheels again.