This flat is absolutely amazing and was an integral part of our successful trip to London. We stayed for just over 5 weeks and there is very little that we would want different or change. I read through the other reviews before (dirty floors, concerns on the building, old couch), but can attest that they shouldn't be of concern to future guests and I will address them first. The entire apartment is hardwood flooring (like our home) and if you walk inside with shoes on after being out in the city, it will get dirty. Even more so if you open the windows, which we did most of the time. The building itself is older but very safe (outdoor fob and key for flat), but it is well appointed and the lift is new. One of the benefits of the building setup is that we didn't hear any other neighbors the entire time we stayed other than the lift door opening. The couch is absolutely on the older/worn side, but was perfectly acceptable and comfortable. If it really bothers you, you can put a mattress cover over it. We did use the mattress cover on the couch, but more out of habit as we do something similar at home.
The things that you will love about this flat are the location, the layout of the flat (feels huge), having a reliable lift and the proximity to so much to do.
The underground and overground are both within a 10 minute walk from the front door and along the way you pass groceries, pubs, restaurants and just a few short steps after the train station is Borough Market. You really can't ask for much more.
Considering we had to work while in London, the layout of the flat is what I was most concerned about before we arrived and only seeing photos, I was nervous. Happily, I can say the setup worked great. There is a little nook/desk in the bedroom where my wife worked and the kitchen table was my space. We were both able to be on calls without disturbing each other and had great cell phone signal. In general, the ceilings are really high and with white walls, it really made everything feel spacious and inviting. Also, this flat is the top floor, so having a lift was essential, especially with the amount of luggage we brought and left with.
The only issue we ever ran into was with the internet, which went down during the first week of our stay. We contacted the hosts and they responded immediately with alternate options for connectivity (which worked great) and then had no other network related concerns. If you are going and need to be connected via VPN to any type of network, I recommend having a backup device. We ended up purchasing one from EE and it worked great and we used it throughout the city.
If you are planning on a longer stay, I would recommend bringing a Roku or Firestick with you. We didn't think about that in advance and ended up grabbing a Firestick with Amazon same day delivery, so we were able to access Netflix and Apple TV (yay Ted Lasso). If you have a computer with you, we also grabbed an HDMI to HDMI cable and left it under the tv for future guests.
All in all, this was one of my favorite Airbnb stays ever and really couldn't have asked for much more. The hosts were amazing, attentive and reliable. If you need a place short term or long term, this should be towards the top of your list.