The flat is nice and in a good Location. However especially the service is nothing great or extraordinary customer experience. It's nice that there is a Nespresso Machine but unfortunately the capsules were missing (although promised in several E-Mails). Also no description where the capsules can be bought (the majority of the shops in the neighbourhood were so small, they didnt sell any coffee at all). No leaflets/tips where to go in Porto, which Restaurants are close by, etc.
Our toiletdoor was broken and we couldnt use it (it was locked from the outside) and it took them very long to come, while we had an urgent need and basically had to leave unwashed the flat to find a closeby toilet.
All in all the flat is very modern und nice, Location is good.
If you just Look for a place to sleep and you are not bothered about the things I mentioned above, it can be a really nice stay.