These are my favorite places when staying in Santiago:
Hospedería San Martín Pinario
Plaza de la Inmaculada, 3. €42,- single ☎ 981 560 282
It is an antique monastery in the old city next to the cathedral. The building has a wonderful history and a great atmosphere. Rooms are basic but clean and comfortable. A fine place to finish your camino.
Hotel Costa Vella
Calle Puerta de la Peña 17 €60,- ☎ 981 569 530
It is a small, charming hotel with a fantastic backyard garden. Very well located near one of the seven gates that lead into the old quarters of the city. Rooms are small, but charming and homey, The staff is very attentive and helpful.
Hostal Campañas de San Juan
Campañas de San Juan 6 €55,- ☎ 981 552 737
Charming place, great atmosphere, Perfect location right next to the cathedral a bit tucked away in a quiet corner. The staff is warm, friendly and helpfull. Rooms are stylish decorated and cozy. The place stands out for its ambiance and service.
One of the properties of Fina Castro Riveiro
Plaza de Pescaderia Vella, nr. 2-1 €15,- ☎ 652 812 389
It is a very good price for a central, well maintained and clean apartment. Fina is a fine lady and she will do anything to make your stay comfortable.
PR Hortas rua da Hortas 30 €38,- ☎ 881 259 018
Friendly family run pension just a few hundred meters from the cathedral square. Very cleean with modern interior. The staff is very friendly and helpful.
Good luck