Very interesting to see negative comments about Plus. My experience - at Airbnb's initiative - was also terrible.
In January '19 I paid €150 for a visit from an experienced apartment photographer along with a young and nervous 'inspector ' who wrote 'Needs upgrading' about my rooms, with zero input as to what exactly was the problem, just poor quality iPhone photos of my furniture (new leather), walls (freshly painted) etc.
This is a listed building in Nice, c. 1850, murals on cathedral ceilings, tiled floors and there are restrictions on improvements but I made some changes anyway, sent off photos (I'm a photographer)....no response apart from 'we'll get back to you'.
I never received any photos from the official photographer, nor Plus listing, nor any explanation of the situation and certainly no refund from Airbnb.
Sounds like I'm the lucky one!
That being said, looking at other online agencies I feel Airbnb is ahead of the game and perhaps their occasional errors of judgement are the price we pay for an innovative platform.