First, Alicia truly is one of the kindest and most generous hosts I have met. On my first day she helped me get acquainted with the neighborhood and even helped me navigate getting a SIM card.
I stayed here for over two months as I was in Spain for a work trip and it quickly felt like home.
The flat:
Everything is renovated and modern
I love the efficient use of space and for some reason really loved the closet in the bedroom.
Quiet - there was very little noise if any. It faces the interior of the building.
Internet - worked great!
I cooked a lot and the stove top was perfect.
It is nice to have the distinct bedroom and living room (rather than the studio) and it made my long stay easy. I felt like I had room to move.
The neighborhood:
<10 min walk to Atocha station or Delicias (total of 1 hour to the airport by train)
5 min walk to Palos de Frontera Metro which gets you to so many places directly or with a quick line switch
10-15 minute walk to Retiro Park
15 min walk to Starbucks (for those like me who still need a taste of home)
Plenty of places to get groceries or food (or beer!). (I have celiac so it is a little harder for me but Madrid has good options within 20 min)
Food delivery: if you feel like eating in, Deliveroo and Glovo are available with tons of options for non-celiacs.
Madrid is a fun city and relatively easy to navigate. This is a super flat. I would recommend it whole-heartedly and after spending over 2 months in a place would either love it or hate it. :D