Lets quickly get to the point, we (me, my boyfriend and baby boy, 8 months old) can highly recommend staying with Rita and José. In fact, we have used a lot of AirBnB and this is by far the best place we have stayed.
Espinho is a funny city, not much to look at, but a genuine Portugese town close to Porto. You can easily get around or drive to Porto from there if you want to explore. Espinho also has good surf conditions in north Portugal, which makes it a ideal place, if you want one of those things or both. We really enjoyed the surf there and our host was very helpful and contacted a surf school for us.
Rita, José and their daughter Benny are just fantastic, the annex is very well furnished with a direct access to the house garden, making it a great place to stay!
They also have a very friendly dog named Mel, which is just fantastic if you are a dog lover and if you are not, she will keep to herself, no worries.
We spent 14 lovely days here and we highly recommend staying at Rita and José.