This was my first time staying in an AirBnB so I was naturally very uneasy about having to spend to months in a stranger's house and choosing the wrong place. Luckily for me these worries drifted right away as soon as I spent a couple of days in Jim and Jacob's house. Everything could not have been more perfect.
I couldn't have had better hosts as Jim and Jacob were extremely nice. I never had any issues whatsoever throughout those two months. They were always "alert" to any needs I might have (without being overbearing). Their dog Betty was also lovely and made it feel more like a home. The other guests (all of which where long-term, which was pretty good) were also very nice.
The room was spacious and luminous even being in the lower ground. Everything worked fine. The mattress was comfortable; the main pillows not so much but there were other (¨"decorative") ones that were good so it wasn't much of an issue. The lower ground floor is a bit colder than the ground floor, but as there was a portable heater it wasn't much of a problem either.
The kitchen was large and luminous and with enough pots and utensils to cook for yourself every day. The only downside was the storage space in the fridge felt a tad small for me, but I cooked everything from scratch so I probably needed a bit more space than the average person.

The location of the house is excellent. If you're taking the tube, it's half a block away from King's Cross station which connects to pretty much the entirety of London. If you're walking, like me, it's still extrmely convenient -- half an hour's walk to Islington, Camden Town, Oxford Street and Covent Garden, or an hour's walk to Westminster. It's a 15 minute walk to the British Museum and just 5 minutes to the Brunswick Centre, where you can find stores like Sainsbury's, Waitrose or Tesco in case you need to buy anything.
The street itself is quite pretty, if you like older films or Ealing comedies like me you will be extremely thrilled as it was the exact same street where Mrs Wilberforce's house from The Ladykillers (1955) is situated (although the front and inside of the house were built and filmed elsewhere, all the shots taken from the entrance door and the ones which take place in the street were filmed right here! -- being so closs to King's Cross you will also appreciate the filming locations for the scenes that take place in and near the station).
All in all I would absolutely recommend this listing to anyone looking for medium or long-term accomodation in London, especially if you want to be in the city centre!