Helena's apartment is in such a great location - literally beside the Mercada de San Miguel and within walking distance of such a lot of interesting places in the centre of Madrid. It's also really thoughtfully equipped with everything you need.
I stayed with my adult daughter so we used both beds, which were both fine for a holiday.
Despite its central location, there's no street noise at all, so the flat is nice and quiet, although you can hear the neighbours as the sound proofing isn't great.