THIS APARTMENT WAS AMAZING!! I will only stay here in Madrid. Firstly, it is huge (a rare find in Europe) with a full kitchen which was equipped with everything you need. I lived here for 6 weeks whilst working in Madrid. I had a full home office set up on the dining table with enough space to still have dinners etc. Even though it is on Calle Fuencarral (main shopping strip in Madrid), it is extremely quiet because of the triple-glazed windows. The air conditioning works extremely well as does the heating. It is super close to everything and in the middle of Chueca. We walked everywhere, but you have 2 metros (Chueca and Tribunal) within a 2 minutes walk if you need it. It is a 5 min walk to Gran Via straight from your front door.
Gigi was the most amazing Air BnB host I've ever had. As I was there so long she gave me a key to the letter box as I had some things delivered and sorted out a little shopping cart for me! The Mercado Barceló is down the road and is huge and amazing for produce (including an entirely organic fruit and veggie shop / health food store / etc!). Also two gluten free bakeries in walking distance (if anyone is reading this and needs them, Leon the Baker is amazing) I could go on, but I cannot recommend this apartment highly enough. The main bathroom is giant and both bedrooms are towards the back of the apartment so mega quiet. They're also dark, but in a good way - I have never slept so well!!
There is wifi, works super well and the TV is a smart TV. I logged into my own Netflix / Amazon Prime / Disney accounts. The suburb is a foody area, traditional and modern. As an Aussie and not used to eating late, I lived off Honest Greens when working late nights (check it out) which is also a 2 minute walk away and open all the time. Around the corner were amazing tapas bars and you have 3 markets surrounding you (two "Gastro" foody markets and the other a genuine local grocery style market). Wine bars / cocktail bars / etc are in abundance.
Do note that there is a lift but goes to the half floors so you will need to carry your luggage up one very small flight of stairs. I am a young female and stayed there alone for a few weeks and felt totally safe and secure, there is a video intercom etc and the building is secure and in a SUPER safe neighborhood. I'll stay here every time I come to Madrid, it is now a second home.