Our flight arrived at midnight in Madrid and Maria was able to arrange for us to get the key and get in about 1 AM!
The room that we had spending 4 days at Maria's was quite large, with tons of drawer space and closet space. The shared main living area was much bigger than we could use, and had a nice feeling for the hours that I was working there.
The WiFi was strong and fast enough for me to do audio meetings for my work, which was very important for our stay. Maria has put in a repeater (extender) but it is not working to get such a strong signal to the large bedroom near the back of the unit that we were using.
Easy walk to the major sights of Madrid. Bring your own coffee & tea, but there is an Italian coffee maker. The stove is gas! This is where we would want to stay if we come back to Madrid.