The apartment is well-located. It's in walking distance (20-30 minutes) from most of the city and it's close to a tram, a metro station, grocery stores, and hip cafes and restaurants. The area itself is quiet and charming, and going for a walk here will give you what seems like a more authentic insight into life in Prague.
The apartment is simple and clean. I wouldn't count on spending a lot of time here, but it's a nice base for exploring the city. The kitchen is only suited for preparing simple meals (e.g., the extractor hood isn't working), but this wasn't a problem for us as it's farly cheap to eat out. The internet is rather unstable. It's fine for communication apps and researching where to go, but it's not exactly streaming quality.
The bathroom is a bit of a minus. The door between the bathroom and kitchen is bascially symbolic, isolating neither in terms of sound nor smell. Also, the bathroom sink is placed at about 1 meters height, making it very difficult to use.
Everything about check in, communication and guidance was very good. Tereza and friends were flexible, fast in responding and helpful when we had any questions.