The apartment is right in the city centre, just a few minutes walk to Gran Via, the Palace and Puerta del Sol. Department stores, supermarkets and a nos. of restaurants are just in the neighbourhood.
The apartment is spacious and cozy, even have terraces overlooking the streets and the Palace from distance.
Annabel is nice and friendly, the supplies are generous. She texted me on my second day of stay to make sure everything's fine and even helped us booking the taxi to the airport.
Just one thing to note, the restaurants down in the street make noises in the night which might be a problem for sensitive people though personally I have no problem at all.