Hate to do this. I've written nothing but glowing reviews for dozens of vaca-rentals and this is the first negative one...but it's richly deserved. First, I'll acknowledge there are plusses: besides my disgreement with hosts they seem like decent chaps; the apartment is appealling and well thought-out; it's quite private. Description calls it a "prestigious" area, and it's pleasant enough, but prestigious is a bit laughable. Not exactly Millionaires Row.
On the downside: no. 1, there is NO VIEW of the Douro River from the apt., at least not when tress are in foliage. None. This isn't just a mischaracterization -- it's a bare-faced lie. Looking out the windows all one sees are the trees of the park across the street. If you didn't already know the river was down there, looking out from the flat will give you no hint. I say if you are interesting anyway, ask the hosts to send pix from the windows right then to compare with what you find when you arrive, in case you need to make a claim with Airbnb later.
But the park itself, while pretty enough, is the major issue. Maybe it was just bad timing. but during my stay it was a magnet for dozens of rude college-age kids who partied literally all night. It started 6-7 pm, absurdly loud, repetitive, thumping beats music from a nightmarish '90s rave (so loud that closed windows, earplugs, and white noise on my tablet cranked to the max could not block it out). This goes on until 1-2, followed by caterwauling, singng, engines revved, dogs barking, until almost dawn. After barely sleeping for four of six nights, I bailed on a 10-day reservation; the mayhem was destroying my vacatiion. I appealled to owner for a partial refund and the reply was, basically, "Sorry. It's your problem, pal, not ours."
I am not just some crank -- feel free to check my reviews, and I how I've been reviewed in turn. All very upbeat. About the most serious complaint I've ever made is I wish there'd been a colander, or some paper towels, around. The owners did offer an apology, as did Airbnb, but that doesn't make my wallet feel any better. Just utterly disastrous...there's no other way to describe my miserable experience.