Our apartment in London was just perfect - everything was new/clean, the beds were comfortable and having 3 bedrooms and a living room/kitchen was awesome for our 5 days in London (we are a family of 4 - kids 13 and 14.5). I loved the location because it was mostly quiet (except when Trump was in town!) and practically in Westminster Abbey's back yard. We walked there in about 3 minutes. There is a grocery store about 2 blocks away, and a few restaurants are blocks away too (Osteria Dell' Angolo was amazing/real deal Italian - felt like we were in Italy).
Also regarding quiet - this seems to be an old building recently renovated. It has very high ceilings, beautiful decor throughout and double windows (old ones were saved and new ones placed inside) so again, very quiet. We had just come from a very old flat in Paris, which did not have double windows and you could hear outside noise as if the windows were open!
One other thing to note about Sonder's place - we usually like to stay in an Airbnb when traveling as a family so we can have space. I've usually had good experiences, but this was amazing because it felt as if you were in a hotel - no personal belongings like toiletries, food, etc. left behind. On the flip side - the kitchen was stocked with all the things you need (even little samples of olive oil and salt and pepper).
I would 100% recommend this flat, and will seek out Sonder again when traveling.