We absolutely loved the staff and the charm at Cooper Hotel.
They're accommodating, kind, clean, and friendly. Great walkable location as well.
They have a nice little tea bar and fresh water in the lobby 24 hours a day for visitors - good for those hiking or acclimating to the altitude. They have free breakfast which includes fresh pancakes, waffles and omelettes. Cooper also stored our luggage during out trek and had an airport pickup service for 10 per person which we utilized when arriving into Cusco.
ONLY negative i have to say is that there is a restaurant/club underneath this hotel/nearby that plays music until 3am! The first two nights we stayed at this hotel, we were on the second floor and heard thumping from music/bass until 3am. After our trek, we came back and they put us on the 3rd floor after requesting a quieter room and it was much better. They said they have filed complaints against the place but its currently out of their hands.
So only tip would be to ask for a quiet room if you prefer to sleep at night. :)
Otherwise - they're fantastic.