The best thing about the apartment is its location! Right in the middle of the Old Town next to Staroměstské náměstí (Old Town Square) and in the walking distance to all the other sights. You won't regret the location at all.
The apartment itslef is cozy and clean wth comfortable beds. You will find everything you need for your stay including some kitchen amenities if you want to have, for example, your breakfast at home.
As the other reviewer said the water pressure in the shower is not very strong but it's strong enough to have your shower =). That kind of water pressure might be standard for Prague, I do not know, I have not stayed anywhere else .
And you will certainly like the hosts! I did not meet Idan personally, but Marta was right there to welcome us at the apartment. They give a number of very useful tips, use them!