Marta's place is very stylish and very central. The location is great as it's in a quiet dead end street so is always peaceful. We were in Santiago during the current protest and it did not effect our stay at all, and everyone was very peaceful and friendly, and the building is very secure and quiet with double glazed windows.
We would highly recommend anyone going to Santiago to go to Jardín Mallinkrodt 170 for either lunch or dinner, it was some of the best food we have ever eaten.