We had a great stay at Ignacio's and Sandra's! The apartment was small but perfect for what could be needed for a holiday/wfh stay.
Ignacio and Sandra were super friendly and facilitated check in and check out on our awkward timings.
The apartment is located on the second floor of an old building. The apartment itself is renovated but still contains old-building-charm. For people who are used to new buildings, they should consider the lack of presence of an elevator and thinner noise isolation to the hallway than what they might be used to.
The apartment had everything someone would need for their stay. We stayed here in end October/start November and it was around 10 degrees outside, so quite cold. Fortunately the apartment is equipped with a small heating system that did wonders.
The location -- amazing! It's surrounded by restaurants and bars, as well as supermarkets and the metro stop is close as well if you don't feel like a 15-20 min walk to e.g. Gran Vía.
We would love to return to Madrid and stay with Ignacio and Sandra again. We definitely recommend!