We had a wonderful time in Madrid. Friendly people and great weather! A lot of attractions can be reached on foot ( The Almudena Cathedral, The Royal Palace, Plaza Mayor and Puerta del Sol ). The bus station La Paloma is 3min. away and the subway station Puerta Toledo 5min. There are a lot of museums, most of them offering free entry for children under 18!!! There are some days and hours when it's free for everyone. When you get tired of culture, there are a lot of parcs to rest and people watch. The food is great with a lot of national dishes on offer.
Our 4 days were packed, but there is still so much we couldn't see. We plan to visit again.