We had 3 very comfortable nights at Leo's apartment in Madrid. It is located close to everything- great bars, restaurants, a supermarket and many of the sightseeing highlights.
There are 2 bedrooms (the 2nd one is very small), with 2 bathrooms, and a comfortable fold out bed from the lounge sofa. The kitchen is modern, has a dishwasher, fridge/freezer and a washing machine. There are lovely balcony doors opening out over the street below, and effective ceiling fans in the bedrooms and lounge.
Be aware this apartment is on the 2nd floor (no lift) if you have heavy luggage to handle.