Pizzi's apartment is comfortable and well-situated in Malasaña. It is exactly as described and check-in was easy. Pizzi very kindly allowed me to check in early since no one was there the night before, which was very welcome after an overnight transatlantic flight. Javier met me and showed me round as Pizzi was out of town for work (the reason why the apartment was available). The apartment is modern and was spotlessly clean.
The fridge and kitchen had everything was well-stocked and had everything I needed, including essentials that Pizzi kindly left for my use. Wifi and TV worked well. The area is exactly where I wanted to be, close to a wide variety of places to eat and drink, near enough to the centre to walk, and relatively close to Casa de Campo park for exercise. Pizzi also gave recommendations of places to eat / drink in the area and was easily contactable through AirBnB / WhatsApp.
All in all, a very pleasant and comfortable stay. I would stay here again without hesitation.