Ok, I used to be exactly your target market.
Middle class, fairly affluent, extended career break. Twins so very keen to get out the house.
I'm very sorry but given the business model you've outlined here I wouldn't have considered joining.
I live in a pretty well off area. For just a wee bit more than your proposed 80 per month we did 3 classes per week (bear in mind fees x 2) were members of a safari park, 2 farm parks, NTS and Historical Scotland. That's not including all the time we spent rounding free museums and art galleries and parks.
With twins I found cafés and soft plays unbelievably stressful although my singleton friends used them approximately once a week.
Re wooden toys. In my time I've volunteered at 3 different baby/toddler/play type groups wooden toys do not last well. They get chewed and stained and scraped and are harder to wipe clean.
IME kids would get bored pretty quickly going to the same place all the time unless you had a) big expensive type toys they didn't get at home b) lots and lots of variety which necessitates both investment and lots of storage.
It's not a haven if you are expected to volunteer.
The time you need a haven for is very limited (max up to 1 year I'd have thought) how many babies are being born in your area?
I don't need help with my CV. As a pp noted I used my connections when it was time to return to work.
I might have attended your business occasionally on a wet day when my children were older on a payg basis. But it would need to be properly staffed, clean and pretty spacious.