Fantastic location, a really good base to explore Madrid - there are many metro stops nearby (note Jan 2020 that Gran Via station is closed for refurbishment so you have to change lines to get there from Atocha). It is only 15min walk to the very center. Check-in was very easy, and the studio is exactly as described and perfect for a solo traveller. If travelling with someone else, be aware that the bathroom is pretty open to the rest of the room (no privacy), but it has everything you could need, including a full size bath and good shower. Top floor with no lift but I didn't find the stairs a problem. Self check-out very easy and they have a good system for storing bags and coming back later to pick them up (if nothing too valuable as other flats in building can access). Would really recommend Edu's place - thanks for everything!