Get a feel for the school. Do the kids seem happy and occupied, are they polite and engaged. You will be able to do this when you walk around, accompanied by the head or whomever.
It's obviously, of course, important to use your eyes and ears and do not just listen to what they say they do!
Does the school have an anti-bullying policy?
Do the school understand about transitioning a new child into a school, a child who has already experienced loss. Most schools should understand this but I did have to explain to the nursery teacher why my little one had 'lost' two sets of parents! In the end he did not go to the nursery because I felt that they did not understand what this may mean for him!
Do they talk about children as individuals and express interest or do they speak about the children in any negative terms?
The facilitates are important but to me are secondary to the staff and the school ethos.
See at least two schools, more if you can realistically get to them. Travelling too far to a school is not a great idea, so choose your radius and look at any good schools in that area.
I am not a massive fan of Ofsted but some put great store by what they say, you can find the details on line somewhere.
Good luck.
And if your new little one may have some learning needs, lots of children do, about 20% of the general population, then it may be worth meeting the Senco or Inclusion manager.