The apartment itself is really charming, it has everything you might possibly need and actually looks better in reality than in the pictures. Rui was readily available at any time to help with whatever issue we had (TV didn't work at first, and on the last day we ran out of gas and there was no hot water – all that was quickly fixed); the girl who met us, Leonor, was super nice and heplful. The wifi worked but wasn't stable, it disappeared at times, in which case unplugging and again plugging in the router hepled.
The only serious problem we came across in this apartment was bedbugs in the upstaris bedroom. They don’t affect most people, but if you belong to the unfortunate 30% of those who are allergic to bedbugs' bites, you're in for trouble. I didn't know I was allergic, as it was the first time in my 40 years of life that I was bitten by bedbugs, so I slept upstairs another night mistakingly taking the bites I already had for those of mosquitos, and as a result I woke up with more terrible bites all over my body. My husband was affected, too, so we moved downstairs to sleep on the sofa, which turned out to be okay - no bedbugs there, luckily. Now that we're home, we still have the marks of the bites on our bodies though. (The sofa is quite comfortable to sleep on, by the way, contrary to the previous commentaries. And there were lots of wine glasses, too, - 6 of them, actually.)
Since the apartment was very clean and there were no bedbugs downstairs, I guess they'd just appeared recently and it shouldn't be much of a problem to get rid of them if the owner takes urgent measures (which he promised to do), so hopefully no bedbugs will be there when you visit.