We (3) stayed three nights in Nancys appartement and really enjoyed our stay! It is a wonderful appartement, very good located. It is not too far to walk to the city center and there are metros also close by.
We never met Nancy in person, but her assisstent Barbara met us at the appartement to give us the keys and to show us around. Everything worked out perfectly.
We would definitely recommend staying at Nancy´s appartement! And we hope to come back some day to Prague!