Good points : a stylish, cosy and extremely clean property. It comes with a small kitchen with pots/pans/kettle if u want to make a meal. A washing machine is available for you to launder your clothes.
Its close to many restaurants and a supermarket within 10min walk. Anton martin subway is just about 5min from the flat.
All of madrid's main attractions are an easy 20min stroll away.
Some points to highlight. The flat is about 15min walk from madrid atocha station (u will arrive here from BCN or from madrid airport), with a slight incline/uphill to the flat. But you can always get a uber to the flat from atocha at €3/4.
The flat is also on the 2nd story (no lifts or elevator) means u gotta lug all your luggages yourself up the steps.
The bathroom is also small and the hot water heater's capacity is good for 2 showers. (cold water for the 3rd)
Otherwise the flat is a charming cosy location in the centre of madrid.
Good for a family of 2 adults and 2 kids. Space might be tight for 4 adults.