Carl is a super nice host. At first there was a lady to help, give us some info... but she did't speak English at all :), though also super sweet. Although, thank you Carl that you introduced us to David who speak English :). Much better communication. We were a group of 7 girls. So as you can imagine... there were some issues with hot water. But if you consider the fact that you are in Spain, it wasn't so bad :). And our hosts quickly responded to all our question and solved them. On the week we stayed in Madrid the weather was cold +9-12 degrees only, so if you are a person who is always cold, even in summer, It could be cold for you in the apartment. Me, personally, I am always warm :), but for other girls it wasn't. If I will came to Madrid again to stay in this flat, I will come in the beginning of summer, o late spring. I would not recommend to sleep on the sofa, for a person, who likes comfy beds. But double beds in the bedrooms were very comfy. So, probably this apartment is more suitable for a group of six. Otherwise I really enjoyed Carl's apartment. Location is perfect, you can visit any touristy place by foot, lots of bars, and restaurant around the neighborhood, food is not good, so I would recommend to listen to Carl's suggestions :). As the only vegan in the group it was tricky for my to stay on the path :)