I stayed at Alicia's flat for 5 days. The location is perfect! Really close to Gran Via - about 10 minutes walk, Prado or Retiro. Neighborhood is so lively also at night but in the flat you will not hear any noises. The building has an elevator.
Alicia is very nice and helpful person - she left for me the subway plan and some leaflets with information about museums, parks etc. She always asked if everything is okay.
I did really love stying at her apartment, for sure I will chose it again while visiting Madrid!
Muchas gracias por todo, Alicia! :)