I stayed here for 2 months whilst working in Madrid and I could not recommend it highly enough. Isabel is great and will give you great tips and help with your stay. The flat was spotless and really comfortable to live in with all the things you will need for your stay including a kitchen well stocked with pots, pans and utensils.
The area is great as well, and although the street is pretty quiet at night, it is very close to lots of lovely bars, restaurants and cafes and it is only 20 minutes walk from Sol. It is also only 5 mins walk from San Bernardo metro station. The only thing to watch out for - as Isabel points out in her description - is that it is on the 3rd floor with no lift so you will definitely get some exercise going up the stairs! Overall, this is an excellent place to stay, both for a weekend or for longer. Thanks Isabel!