Diogo's aparment is in a great location - slightly off the touristic path. It will take you about 15 minutes to walk to Cais de Sodre and about 20 minutes to the center of town. The apartment itself had a few issues with cleanliness, and when approached about this, Diogo was extremely apologetic. There is no natural light and no windows, but it is ground level and has it's own entrance. Plenty of cafes/restaurants and markets around.