It was my first time in Madrid and I spent 2 days at the apartment. It is wonderfully located in the heart of everything. I walked everywhere and never used public transport.
The noise level is a lot, even at 5am as it's a super trendy spot, but I am someone who loves that and have no trouble sleeping through anything.
I loved the windows and the water pressure of the shower. It would have been nice to be welcomed with water and coffee as a nice gesture to the welcome check-in.
The space is small and ideal for a solo traveler like me or a couple. I would absolutely stay here again.