I like it. I prefer Eva, pronounced the Spanish way so it sounds like AY-va, but Ava is good too. The main reason I prefer Eva is because Ava is more popular (and also because I like E better than A "AY"). I like the look of both names.
I also like Aviana "Ava", etc. I wouldn't use Ava myself, bit if I had to I'd give it a longish middle name that wasn't very common.