Issue with WiFi on last day, but working although host did respond and try to fix it.
This was not a problem for me because I could use my personal data on my phone, but may have been a problem if guest had limited data.
Electricity cut out if using too many appliances at the same time. Resolved by switching back on at fuse box. I have stayed in Portugal several times and this seems to be a common problem with the electricity there.
Apart from that the apartment is clean, tidy, comfortable and very central. I would recommend to anyone wanting to visit Porto.