Oh My G.
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Entrance is 7 Eur, and it's more of a gallery than a museum, so is it worth it?
Are you an art lover?
If so, you can spend about an hour if you take pictures. 45 min if you don't.
If you're not an art over, it's not for you and probably 7 Eur is too much.
The exhibition (which is permanent) is not huge (4 rooms, 2 floors) and not ground breaking but - there are a few very interesting and impressive artwork.
If you want something a bit different then churches and cathedrals - this place is a refreshing change.