I stayed at Illas Inn three times during my three weeks in Cusco, as i was traveling around and coming back to Cusco each time, so had three different reservations.
Each time my stay in this hotel was great, tge breakfast delicious, the neighborhoods perfect and a walking distance from all important places of the center, check in and check out process easy and quick, the staff always accommodating and smiling, every resquest i had was met with readiness and kindness (each time i left i needed to leave my suitcase behind, for example; or the last time i wanted to check out several hours later than the check out time - it was done very readily and for a minimum fee).
I'll absolutely stay in this hotel when visiting Cusco again :)