We are a family of 3 and we visited Prague in February 2018. It was exceptionally cold that week and having a cozy, stylish apartment with a nice fire place and enough wood to keep us warm (of course, the place has a central heating system as well, fireplace is just a beautiful extra touch) made our stay extra special.
The location is fantastic- just behind the National Theater, surrounded by delicious restaurants, recommended in a little, private guide for Prague dining written by Jiri and his son and available in the apartment.
The apartment is decorated in a very personal way and it felt like home the minute we walked in. It is a place of someone and for someone cultured with a sense of style. Jiri has made a rich library in the apartment sharing with his guests books of many different genres and languages. While staying there I read 2 books and one of the reasons to go back- would be to read some more.
So far we stayed in airbnb apartments that were stripped down of personal touches like books, art etc. Jiri's apartment is nothing like that and we highly recommended it to anyone who plans on visiting Prague.