I don't use rabbit boarders so can't really comment on my experiences or compare with others. What I would be looking for is plenty of space (at least 2m x 2m for small rabbits), non-slip floors, excellent hygiene and good storage for hay, etc. Dry goods to be stored away from possible contact with boarders. All surfaces to be easy to clean (ie. no unpainted wood, toys that can't be cleaned, etc) and preferably able to swab or hose down with a good disinfectant (eg bleach or Virkon) between customers. Indoors, plastic dividers would be my preference over mesh ones - reduces chance of infection cross over and easier to clean as there are fewer areas to trap hay, dust, etc. Waste disposal area to be well away from boarders. All areas to be easily visible so boarders can be checked on frequently throughout the day (either directly or via CCTV) so that problems can be picked up on early.
From the pictures on your web site, I would prefer the concrete slabs to be grouted (ie a solid surface with no gaps between them), no unpainted wood for improved hygiene (there are some repair pieces visible), intact roofing (eg onduline corrugated roofing rather than felt which isn't fastened at the corners), secure bolts with padlocks (or a completely secure area) and foxproofing, etc. It makes it look a lot more professional and easier for you to clean.
I would expect a much higher level of security and hygiene in a boarding establishment than at home, but I would compromise on a reduced space for a short stay. I want my pets back in as good a condition as I sent them - clean, healthy, happy, groomed, no diseases or parasites.
Hope this helps.