They suggest that you plant strawberries 12 inches apart, I have them in a raised bed and do the square foot gardening method so I planted them closer together.
If you plant borage in with the strawberries its suppose to help them produce better and taste better, plus bees LOVE borage.
I also do the companion planting which is great if you are limited on space.
I utilize every inch of soil I have, using the square foot gardening and the companion planting together.
I have 25 raised beds and it works great for me.
The companion planting is what bee happy was referring to only the squash, beans and corn is referred to as the three sisters garden.
There are many other things that can be planted together that support each other.
Also, if you are looking to save space go vertical on all that you can.
Most any vining vegetable can be grown on a trellis.
I grow all of my squash, cucumbers and beans on trellis, teepees or obelisks in the garden and you can plant other things around them.
For strawberries I just saw this method online of growing them in pvc pipes that are cut in half lengthwise hung on a fence around the garden, you plant the strawberries (I have seen lettuce and spinach also) in the hollowed out section.
It looked pretty neat and saves space but I have no idea how safe the materials are to grow food in, then again I imagine drinking out of plastic bottles is probably no different.