What is Spanish like at A level?

It depends on how good your teacher is, your levels of natural ability, and your commitment. Compared with French, the grammar is far simpler, and it's phonetic to read, so that already gives a great headstart.

What grade did you get and did you enjoy it?

I got an A (in the days before A*), but I got that in 24 months from scratch, so was quite pleased, and read Modern Languages for my undergrad degree. I really enjoyed it. I didn't like my teacher, - but realised that that would become an impediment to doing well, so just got on with it.