As stated in title 
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33f London looking for a female travel buddy for Barcelona
Finding someone from back home will probably be safer. If something goes wrong you won't have to chase the person down in another country.
Perhaps someone you went to school with or someone you worked with. Or, in a pinch, someone a friend recommends.
- You might want to narrow down the time of year and roughly how long. Work up a possible budget so you can discuss how much you can afford for accommodation and other stuff.
Google search says:
"May to June and September to October, when you will find warm temperatures, manageable crowds, and vibrant local events."
Up to you.