I stayed at Tania's apartment for an entire month and my entire stay was great!
Location: the apartment is conveniently located about a 5-minute walk from the Argüelles metro station and is surrounded by restaurants, grocery stores, drugstores, bakeries, etc. It is very centrally located and an easy walk from downtown (Gran Vía / Plaza de España).
Apartment: Small but cozy and it had everything we needed. The bed was very comfortable, the shower was nice, the WiFi was super fast. It has air conditioning and heating. And it is very safely located inside a courtyard with secure windows. It was very quiet and we felt at ease.
Host: Tania was fantastic! She coordinated my check-in and check-out very efficiently. She was flexible and extremely responsive. She also was there whenever we needed her for tips or recommendations; we had the best paella experience because we asked her where to go. She is also a very nice person.
I would stay at Tania's apartment again anytime! Highly recommend it!