At first, we had a bad impression about it because there was a problem with our room so we had to go to another apartment which wasn't ready even 2 hours after our check-in time. The street is dark and the building looked like scary at first glance with a smell of old age.
Once inside, the apartment is totally new, clean, roomy and comfortable.
A last issue. It was too hot in Prague and the air conditioner wasn't working too.
In short, we had mixed feelings about our reservantion.