I recommend this listing. Pedro is SUPER responsive and nice - he checked in on us via email daily. When I had a question, he called me less than an hour later.
Checkin in was easy. Pedro's place is super clean, newly renovated, comes with a new TV and fan (no aircon), wifi, microwave, fridge, washer/dryer, and filled with dishes. The location is a 7 min walk from the train station, 15 min train from financial district, 40 min drive from LHR, and 1 hr 30 min drive from other airports. The two full size beds are very comfortable and comes with white super clean sheets and lots of pillows. Each bedroom has a closet with hangers. Pedro leaves teas, cookies, jams, and a guide book in the kitchen.
There's a cafe next door with coffee, smoothies, and sandwiches - and the Kensington Park is just a few block away. Also a yoga and pilates studio next door if you need to get your work out on (they have an intro class discount)
The only advice I'll note is that it's on the top floor which I didn't really care about at first, but this means you will be sweating after climbing up 4 flights of stairs with your suitcase. However, it's nice and quiet at the top. One day we even woke up to the sound of trumpets playing songs in the distance - so relaxing.
Just wanted to give as much details as possible to prove you will be happy staying here.