Hi, I recomend in Aguas Calientes: Gringo Bill´s hostal, have nice rooms with hot water, family atmosphere, natural ambience, the rooms are decored with pictures and murals, very nice really. The price is not so cheap around $ 75 a double room, but is a very good option, you will have a nice accommodation.
There have other option for sure, as Pachacutec hostal, around $ 30 a double room, is nice too, have hot water and comfotables room, cheaper, another option is La Pequeña Casita hostal around $ 30 a double room, and the Cabaña hostal around $ 40 a double room, the last one is a boutique hostal, very nice really. All of them options are good, but i recomended gringo bill´s because have a social atmosphere as you want, to meet new people to travel toguether or for friendship. That´s all that can i tell you.