Angelina's flat is exactly as described. It is small and comfortable and well equipped. We were particularly surprised that basics for breakfast were provided, as were cooking items like oil and vinegar, lots of lovely teas and fruit.
The best thing about it ( and we didn't fully appreciate this when we booked) is the location. For three days we were able to walk to all the places and attractions we wanted to see. This reduced the guilt for indulging in lots of delicious food in the city centre and locally. Angelina offered a few restaurant suggestions and these were very good, just a few minutes walk away. Also try Los Chuchis.
Last but not least, the bed is firm and comfortable and the linen and towels were soft and white. All in all, for us this was a great choice and Madrid is wonderful. Definitely warrants another visit.