We had a great 5 night stay in February in Elizabeth's flat. There were 5 of us, 2 adults and 3 kids (aged 10, 7 and 4) The flat is on the second floor and there is a lift which could fit us all in with our suitcases!
The apartment is in a great location in the heart of Chueca - we walked to most places (only exceptions were the football stadium and the theme park which were both easy on the Metro). There are loads of places to eat and drink right by the flat. We had a few meals around Calle de Hortaleza which is a minute away.
Elizabeth is a great host - she was very welcoming (even teaching the kids a bit of Spanish!). She was always on the end of the phone if needed and we did need it as unfortunately one of our children was sick one night so we needed a bit of assistance with extra bedding. Thanks to Elizabeth for helping us out. We all had a brilliant trip - Madrid is a great city, so vibrant and full of history and culture as well as cafes and bars. Highly recommend.