From Metro Station UChile, get to Serrano exit and walk to next intersection, same as you would from a bus, anyone, walk south till you find Paris street and follow up to Londres street where you turn right to the 89 number.
If you missed the way out of Serrano, and got to Iglesia San Francisco, not a problem, turn right , or head south for Londres street, up to you get the 89 number.

From Metro Universidad de Chile (subway), walking, take, out to, Serrano Street , then walk to Paris Street, walk for net intersection, Londres street, turn right and walk till you find the 89 number, here just call on the 103 apartment, Gloria will be ready to help you.
Should you come in a cab; tell him to go to Santiago Centro, Serrano, Paris and Londres 89.