The apartment is very nice and clean, it seems to be very new. All we needed was present, including towels etc. On the other hand, we did find out that there was no free parking space near the apartment, which was not an issue in our case because we did not have the car yet in Porto. However, it is stated that parking space is available which is not correct.
Also, we informed Miguel that our expected time of arrival would be 18h30 and sent him a message when we left the airport (as we agreed with him to do on beforehand). However, we did not receive a reply to that message, and when calling Miguel, he informed us he expected us to arrive only at 20h. It is unclear why.
Despite all of that, we appreciated it very much that, once we called Miguel, he responded immediately, and arranged that somebody would help for the check-in, such that the waiting time at the apartment was only 15 min after calling him.
In summary, we had a nice stay in Porto and we would recommend the apartment.