Eña's place is a nice studio located close to the city centre. It's equipped with AC (very important in summer in Madrid), a fan, various kitchen appliances, a TV set, an iron. It has a huge terrace with a sitting hammock. There's a grocery store and a very nice cafe next door which was very convenient. There are three metro stations located within 5-10 minutes of walking. We haven't met Eña personally but we stayed in contact and she was helpful.