Me and my girlfriend lived here for 6 days. It was a pleasure. Soledad is the perfect host, warm and welcoming.
The apartment itself is like Chile, a combination of old and new, which I love. The view and location is outstanding. It's right by the metro and hill of Santa Lucia. It feels safe and everything reachable by foot or from the aforementioned metro station. The balcony is perfect for a glass of wine after a long day exploring the city.
Caveats:
1 - This apartment is very minimal. For us it was perfect as we wanted a beautiful view and good placement since we ate all our meals in restaurants and cafes. However if you travel backpacker style with plans to make food yourself the kitchen setup can be a bit simple.
2 - Noise. This is in the literal middle of the city so there is constant traffic noise from the main road by the hill. Also not a problem for us since we spent most of the time exploring the city.
If the two caveats above mean nothing to you I can recommend this with all my heart.