Jona's apartment is an excellent place to stay in Madrid. It's a nicely decorated place, that makes you feel like if you were at home. Centrally located and within walking distance to bus stops at Puente de Segovia. The Principe Pio metro station that serves lines 6 and 10 is also a few blocks away, a 15-minute walk, more or less.
The Royal Palace of Madrid and Cathedral of the Santa Maria de la Almudena are also close to the apartment, about a 15-20 minute walk. The famous Mercado de San Miguel is nearby too.
Excellent communication with Jona, and his instructions and suggestions makes everything easier for you. We appreciated that.