Very nice and spacious apartment. Check-in/out was very flexible and nice. Lots of useful informations and there was already a carafe of port waiting!
The apartment was big enough for us 5, 7 our 8 people should also be possible. Walking distance to the hot spots, absolutely no car necessary (searching for a parking lot might be interesting there ;-) ).
No hvac but ventilators in every room so it was no problem in August.
Only thing you should be aware of: it is in the middle of the city and there are also many seagulls around, therefore it is not a quiet spot ;-)
For us it was perfect and we enjoyed our time at porto.
Michael+family