Just got back from a visit to several places in Europe, including Santiago de Compostela. I had spent four weeks there back in college fifty years ago. It was fun to be there again, but this time just for a few days. But notably many, many more pilgrims and tourists now. And many pilgrims are happy to share their tales of walking the “camino”. We stayed at a small hotel called Hotel Montes. They have an elevator which can be accessed if you enter through their small restaurant entrance on Praza de Fonseca. If you enter through their giftshop on Rua do Vilar you have to walk up one flight to reception to catch the elevator. Breakfast was included in our price. Located only a block away from the cathedral and main plaza, so right in the heart of the historical center. Lots of restaurants in area. Very walkable Old Town, most of which is pedestrianized, but not walkable to train station. Hotel can call a taxi for you. Website says they have air conditioning. I know you said you are planning your trip for August but ithe Feast of Santiago is July 25 and there are all kinds of great activities that go on for several days , many that feature traditional Galician clothing, music, foods, etc. That is a great time to visit.