We love the apartment. The location is perfect, just across the local park. It's easy to get around with tram. I am traveling with family of four. The kids can sleep in the sofa bed. But I think it won't be comfortable for adults. So it's best for couple or parents with kids.
The interior is stylist. I especially love the kitchen, equipped with everything we need. Bathroom is large and sparkling clean. The shower and hot water worked well. Wifi is fast, and you can watch YouTube via TV, which made me difficult to force my kids to go out ;)
Overall, it's a nice place to stay in Prague 1.