We had a great experience in Elizabeth's apartment. She received us very well and overall we liked the apartment a lot! The location is perfect and there is enough space for 4 or even 6 persons.
One thing we didn't expect is that there is a shared entrance for 2 other apartments on the same floor, it wasn't mentioned in the advertisement.
Elizabeth is a great host who speaks Spanish and English fluently. I would definitely recommend her apartment in Madrid.