We (two friends for 2 nights) had a excellent stay in this flat. I was a bit concerned about the location as it isn't as central as other options but it's actually great (2 mins from the nearest train and only a couple of minutes from Luis Bridge). There are also great views from this side of the river.
When we visited the flat was spotless and we had more than enough room. As others have mentioned no basics were provided in the kitchen so if you wanted to cook you'd need to buy some supplies. We were eating out so it was fine for us.
Communication and directions were good although we did have some trouble with the front door being a bit tempramental (but thay might just be us!).
There is a nice local bakery round the corner which we had breakfast at. Would also recommend a river cruise and a visit to a port lodge.
We really enjoyed our visit to beautiful Porto and would stay in the flat again!