We stayed at Juliens place for 7 nights and highly recommend it for a couple.
It is right at Tirso de Molina, an easy walk to Sol or Anton Martin, or you can get the Metro if you like.
On some nights there was a bit of street noise but it didn’t really bother us, we hadn’t earplugs but didn’t need to use them.
The wifi was excellent as was the bathroom and kitchen area.
Julien left coffee for us and oil, salt, pepper, etc.
Julien answered messages immediately and accommodated us one day earlier than our original booking.
There were a few dodgy looking characters in the square area but we had no issues with anyone when walking late at night.
The best restaurant nearby is called Badila and is open for menu of the day lunch only.
Our favourite nearby bar was Ferreteria in Anton Martin.
We would stay here again if we return to Madrid