We stayed for 4 night in Sonia's apartment. The apartment is clean, comfortable and in a very nice building. It is located in a convenient neighbourhood of Madrid, within a 10 minute walk to the Prado Museum and a block to the Gran Via. There are many restaurants in the area, offering all types of cuisine. If you are looking to eat in, there are a number of supermarkets located nearby and the kitchen is well-equipped. The outdoor terrace is a wonderful place to enjoy an outdoor meal or drink.
We will definitely stay here again when we return to Madrid.