The place is very much centrally located. Metro and bus stops are very close to the house. So is the royal palace and the other tourist attractions. House is clean and very comfortable for a pair of couples.
Daniel and his wife are very helpful and would respond quickly to all queries.
PS: One tip for Madrid. Do not hire a rental car. There are resident only roads which you cannot enter. Parking is not free any where . if you have to go to different attractions , paid car parking is maximum for 2 hours only. We suggest to use public transport in Madrid until necessary.