I stayed at the Saintlo Jail Hostel for 2 nights and loved the experience! The concept is great and really well thought. I had a single person cell. It was tiny, but with the very high ceilings it was not oppressing, and felt very cozy! The room, bathroom and common areas were extremely clean! One of the cleanest hostels I have ever stayed at. The hostel is located in a very convenient place, about 10 minute-walk to the Parliament and 5 minute-walk to the Mall.
Would definitely recommend staying there!