Everything went so smoothly during our stay at Nicolas & Maria's place. Although we did not meet them, they got us in contact with Ana who was managing the apt. She allowed us to meet her at the apt a little early so we can drop our bags off and go on sight seeing. Ana was so helpful and showed us places to go and had lots of helpful tips for us first timers.
The apartment itself is very clean and had everything we needed. Should you decide to take some time from sight seeing and want to stay home, the view from the balcony is spectacular! It was also nice to unwind at night with a glass (or bottle...) of wine and look out the balcony. The 3 flights of stairs seem intimidating (carrying your suitcase up, nonetheless) but they weren't terrible.
Location-wise, the apt is about 10-15 minute walk to a lot of sights, but if you're not into walking the steep hills, Ubers are inexpensive, especially if there is more than one person to split the cost.