This was our fourth time in Donostia so we know what to expect. This location was great, but keep in mind that it is in the heart of Old Town so can be quite loud until the bars are closed, especially if it is warm and you need to sleep with the windows open. And the trucks start restocking the bars early and the trash trucks come early and are loud too. So, if you are staying in Old Town, keep in mind that it can be loud. However, this apartment was perfect with a large third floor patio overlooking Constitution Square. It also has a dryer, which is nice.
We would definitely stay again.