I have a thing against doing long reviews but this place changed my mind.....
The big question in the reviews I like to see is if the guest would stay there again... YES is my answer. So there is your TLDR :)
Long answer:
Great Location. Stayed for 2 weeks. A lot of good restaurants. It was 10-15 min walking distance to just about any major tourist location. Want to get to Prado ~10 min, Want to get to Sol 10 min. Want to get to the train station 15-20 min. The Palace or Gran Via about 15 min.
Local Grocery store is 5 min or less away. SIM chip place is less than 2 mins away next to the Tabaco/convenience store
They originally had the router out in the hallway, but the hosts were nice enough to move into the apartment prior to my arrival. It's a WiFi 6 router in the apartment with some ethernet jacks available. So if you plan on working remote you can. The internet latency is really low about 3-10ms which is great for those teams/zoom/webex/etc meetings. The speed varies but should be well over 20mbps up and down. I got 100+ most of the time. But low latency is what you need if you want good virtual meetings.
If you have a WiFi 6 laptop/tablet/phone you should get those times if you are in the kitchen/living room. And of course ethernet cable should hit hit those times.
Air Conditioner works great!
Both the Bed and the Couch are of the memory foam variety. And both were comfy to me. I can't speak to the pull out bed under the couch. I just was sometimes too lazy to move from the couch and fell asleep there.
I can't speak to the kitchen stove or microwave.
Refrigerator works great.
So the cons :
They are building a new elevator for the building so you will have to walk up stairs until it is built.
After about 4 continuous hours, My back didn't like the chairs in the kitchen, Your back mileage may vary. So after the first week I looked for other arrangements.
Luckily, There is also a Co-working location you can rent on your own(separate from AirBnB); It's only about 25 meters or so from the apartment building on across the street. Plus free on-demand expresso and water with your membership there. I would walk across the street to the apartment for my zoom/teams meeting then head back to the co-working place for normal work. This made for a nice work setup.
If you need hot showers like steaming hot .... not the best place for you. But if you just need really warm showers it works. You won't fog up any windows or mirrors but the water does get warm. I showered just fine the way it was; comfortable enough to get the job done.
Hope this helps.