After the pleasant surprise from a couple of days ago a small reality check....
My home stay on one of the islands on Titicaca was with 5 Spanish girls, where I was the only non native Spanish speaker.
After a month in Cusco and hearing slowly spoken Spanish, trying to understand conversations in Spanish spoken by Spanish people was useful reminder that although it's all Spanish, it is different across the world and people from Spain speak *fast* and slur their words. For a lot of the time I couldn't pick out words, just that they were talking.
It will be interesting to see what the Spanish is like in Bolivia and Chile.
There was another useful reminder that my Spanish isn't all that, but that's for the post I need to write on visiting Titicaca and the islands.