We had a great time in the apartment of Frantisek & Erika. It is super located - the Charles Bridge, Old Town, Castle, etc. are all in walking distance and at the same time it is located outside of the touristic chaos and noise you want to avoid. The roof top terrace is unique. Frantisek & Erika are really great hosts - very welcoming & helpful, they left some necessities in the fridge to survive the first day and they were also flexible for an early check-in. I can only recommend it.