A friend and I spent a mostly pleasant month at Michael’s flat in central Madrid. It’s location couldn’t be better and it's less than a 10 minute walk from the Puerta del Sol and the Plaza Mayor and perhaps 15 minutes to the three best museums in Madrid. Supermarkets and good restaurants also abound. It's a decent option for remote work. My friend was prepping for an exam and there's a corner of the flat dedicated to a work space that worked well. It's an interior unit (no view of street) and a bit dark but the interior lighting works well. Part way though our stay reform work started in the flat above—a pretty common occurrence in these older neighborhoods. It got quite loud at times. It’s worth inquiring about the status if you’re planning on spending extended periods during the day at home. That inconvenience aside, I do recommend the flat for any length stay in central Madrid.