Second time in prague, second time at Sir Tobys.
Stayed at a private double room. It looked like a 4 star hotel. Big room, clean, with balcony. Free coffee and tea. Friendly and helpful staff 24/7. Excellent wi fi connection. Safe.
Take into account it is away from the centre and almost certainly you must catch a tram to get tp the castle or the main square.
I would definitely recommens this hostel. Really enjoyed our stay here.