The apartment is right in the Casco Viejo, very near to Plaza Nueva and all the other bars and restaurants. Only you have to climb many stairs up the Plaza Unamuno, a sitting place of many mostly young people. But it is rather quiet during the nights.
It has really good windows.
The apartment is big and well equipped and the kitchen has lots of useful tools.
The host even had coffee, milk and biscuits for the breakfast. Its a good place to stay.