I've filled it in for Inky
For anyone struggling with the conversions, then
Length x Width = size in sq cm
Then type "5302.5 square cm in square inches" and out will pop your size
However, I do think it would be useful if you specified that you were just talking about footprint, as otherwise many will count shelves. I'd also suggest putting in more sizes below 360 sq inches - Inky's first, brief, cage was 210 sq inches (shudder), but we've all seen cages even smaller than that.
Instead of the vague question about enjoyment, maybe you could ask if your hamster...
- chews the bars
- uses all of the space available
etc. etc. (with the option to pick multiple choices!)
Perhaps you could also ask questions about wheel size, food (i.e. what brand, with an option for other) and enrichment (tick all that apply from a list of common toys, plus a free text option)?