Casa Matilda is kind of a bed and breakfast style place as it does not have a manned front desk after about 5 pm. They do have a number to call in case there is any issue, and I never actually had any issue at all. Nevertheless, the location was perfect for me as I was working a couple blocks away. During the day the staff was extremely helpful and friendly and the breakfast was everything I needed including fresh fruit and traditional Spanish dishes. There is a school that uses the courtyard behind the hotel, so during the day there was sometimes a "joyful noise" out back. Sometimes I enjoyed it and other times I was looking for my earplugs so that I could focus better. There are plenty of cafes around, so there is no problem finding a meal. I particularly liked the sushi at a nearby grocery store, so I tended to go there. The rooms have a fridge, so I kept my own beverages and a few other things around for meals. This would be a great place to stay for several days while you explore the city. Attractions are walkable or you can take the metro if you prefer.