Hi there,
That's really exciting! I'm not familiar with Oviedo enough to know which areas to focus on, however, I would suggest reaching out to a local real estate agent to get insights from someone on the ground. Here is one suggestion - Agencia Alvarez: https://www.agenciaalvarez.com/
Since Oviedo isn't a popular city for expats it may be challenging to find a real estate agent who speaks English. Do you speak Spanish by chance?
Idealista.com is a popular website to check real estate go get an idea of what's on the market, you can also see listings by individuals and agents. That may be a good place to find other agents to speak to. https://www.idealista.com/
Best,
Cepee, IL Correspondent - Spain