We had a pleasure of staying at Eugénia’s place in Porto. And I must stay that Eugénia is an amazing host with lots of tips about Porto (literally there are folders on the table filled with helpful tips, maps, photos and etc) and always ready to reply on all your questions. Eugénia and her husband greeted us with some lovely Port wine and chocolate, so we felt really welcomed. Oh and great communication as well!
Apartment located is very good and if you traveling by car, there is a dedicated spot in the underground garage. Getting inside & outside (by car) is a bit tricky because of the traffic, but we managed to do it just fine.
If you don't want to explore Porto by car, center is in the walking distance and when you are exhausted & tired in the evening, we recommend to take an Uber, we paid not more than 4 euros.
Only downside I can mention, is that all windows point to the street and if you are a very light sleeper, that can be a problem in the early morning. I am sure that shouldn't be a huge problem though, as after a hard day of walking and exploring Porto (and perhaps some Port wine tastings) this shouldn't be an issue and we slept just fine.