My friend and I found the apartment to be exactly as described - clean, modern and very conveniently located, making it easy to explore Madrid by foot or metro, if necessary. The neighborhood it's in has some cool shops, cafes and bars and yet the apartment itself is quiet as it is located in a block built in the inner courtyard of the main block facing the street.
I must add that Patricia and her husband Alvaro were incredibly welcoming and helpful hosts! I had a little mishap on my trip, which could've ended quite badly had they not immediately offered their help, and help they did! Upon my arrival in Madrid i realized that I left my passport in a hotel in Barcelona and the hotel said they would not do anything to reunite it with me and I'd have to make my own arrangements, Patricia and Alvaro immediately took it upon themselves to hire a courier company, coordinate with the hotel and make sure that I receive the passport in Madrid well before my flight back home. 24 hours later I had my passport!
I would no doubt recommend Patricia's apartment to anyone traveling to Madrid and would stay there again myself if I happen to return!