This flat was absolutely perfect for our 3 month stay in Madrid. Ideally located (20min walk from the center), with bus and metro stations very close, and right next to Casa del Campo and Madrid Río, which were great places to go walk and run.
It is fully furnished and a great size for three people (you just have to be aware that one of the bedrooms is much smaller than the other two, but is still a reasonable size).
The apartment building is very calm, clean and there is lots of natural lighting.
I would totally recommend for any stay in Madrid, long or short!