Excellent location to visit the city. Right next to the museum, 15 minutes from the old city!
You won't see the owner more than 2 minutes when you arrive. So, don't be looking for a warm local welcoming.
The amenities are OK for Czech standard I guess. You can easily fit 4, and probably 6 people in the apartement, so that's good.
The big issue for us was that the wifi signal was very low, sometimes we could not even connect... When you use heavily the internet for communication with you family or plane online check-in, this could be an issue. Also, the street is really noisy; so you won't open the window for long except for getting some air (once the windows are shut the noise level is OK to sleep though).
I would say that it is good value for the price, if you expect to be out most of the time and are looking for a low price.