I highly recommend Casa Nuncio. My husband and I stayed here over the Christmas holidays with our 6 year old son. The apartment is beautifully appointed, spacious (with gorgeous high ceilings) and comfortable. The beds were comfortable and the bathrooms were spacious. The living room is lovely and well lit. La Latina is also the perfect neighborhood to rest your head while staying in Madrid. It’s very centrally located but on a quiet, cute street that is accessible to all major attractions and public transport. Carmina gave us a warm welcome and provided us with all of the info we needed to get settled. She also prepared snacks and a bottle of wine which was a lovely touch. We will definitely be back soon!