The location is perfect, the flat is just round the corner from the metro and supermarket. I mostly walked to all the gardens, museums and shops I visited because everything is walking distance.
Augusto is very easygoing and was flexible with my check-in and check-out time which made things so much easier for me. He was also very kind as to help me carry my suitcase up and down the stairs.
I highly recommend you choose this apartment for your stay in Madrid!