I think I’d probably go for it just based on price in the knowledge that the flight time would be crap and the hotel not one I’d choose (looks like it’s on the outskirts and any hotel that boasts complimentary hairdryers as a feature isn’t going to be deluxe!), Prague however is such an incredibly beautiful city that it would make up for that - & as you say, how much time would you want to spend in the hotel anyway? We went in a February years ago and the cafe’s serve hot spiced red wine and have outside heaters. It’s very atmospheric in winter! We did a ghost walk at night around the old town with teenage DDs which was great!