Excellent central location. The airport bus comes into the square just up from the apartment and you can easily walk to most things from there, or catch a bus to things that are further out.
The flat is clean and the shower is excellent - a big thing for me! There was plenty of room for the two of us and I think it would work well for four but the lounge area would be a bit cramped.
Check in was easy and Albert had helpful suggestions on where to eat.
The downside is that the apartment is very central (!) and so there is a lot of traffic noise until late at night - the street outside is one of the main traffic roads. You can hear the rumbling of the underground trains which start early and finish late. Not a problem if you're used to it, but we live in the country and so very used to quiet at night time.