The location is fantastic--no question about that! However, you also get street noise from the cable cars if the windows are open (and the peacocks, which we liked), and in the summer there is no A/C so we had to have the windows open a bit.
We stayed for 11 nights in June and really liked having all the extra space but in the end didn't think it was worth the cost compared to other places, especially since it is decorated nicely but the basic apartment has not been renovated well and could use updating. If you are traveling with a family or large group this is probably a good fit, but for just one or two people I don't think it is worth the price.
The place is truly enormous! However, the kitchen is not very big, only one person can work in there at a time, and the floor is poorly installed so there are gaps in the boards. The toilet is at the very far end of the apartment from the bedroom, which is not great at night. Good privacy though.
We loved easy (2-3 minute walk) access to the metro and tram stops, and Charles Bridge is a 5 minute walk away. There are two major free gardens right next to the apartment and that was a great escape!
Over all, a good place that I might consider staying again if traveling with more than two people, but maybe not for just the two of us.