We had a lovely stay at Alex and Kate's apartment! The apartment is large and is just as pictured. The location is excellent - easy walking distance to all of the major sites.
We recommend taking advantage of the airport transfer offered by Alex and Kate. It was seamless and a good value, and the driver took us directly to the apartment and provided the keys, a map, and tips.
As noted in the description, the building itself is under construction. This was a little unsettling for us because there were very few other tenants living in this section of the building and the workers would prop open the outer doors during the day, which did not make the apartment feel as secure as it could have.