My family spent a week at Mayfair House during Summer 2022. We usually stay in a hotel but being WImbeldon we struggled to find affordable accommodation at the last minute. Our apartment was 2 bedroom and overlooked the street which was nice and sunny. Due to its very central (amazing) location there is a bit of street noise at closing time from the multiplicity of pubs and restaurants at its door. The noise didn't bother us so much but it might bother others. The rooms are modern and well maintained and the aircon worked fairly well seeing as it was a heatwave -- the aircon systems are not that modern but they worked well enough (just!).
There was no laundry as stated however there was a washer/dryer in the kitchen which was very handy and we used a lot. There was an iron and ironing board too.
If I'm going to be pedantic, the kitchen was a bit pokey with no natural light. We didn't end up using it in the end as there were so many fabulous restaurants right on the street.
We checked our luggage in early and went to see a show - when we returned our luggage was already in our room. Perfect!
The 24 hour concierge was as good as any hotel and certainly better than most airbnb's.
For the price on a Wimbeldon week in London, we were happy with our stay at Mayfair House and would certainly return again.