Yes, I should know better, but recently I bought some coffee at Simon Levelt. After having a really not nice discussion about robusta for espresso and the way they store their beans.
I've ask if they had beans in valve bags, for optimum freshness (at least for old beans). No they didn't sell their beans in bags, but they had a special designed (big) glass and metal storage thing where the beans are sold from.
And that was much better than any bag in the world. Well I prevent a valve bag over an open storage thing due to the oxidation of the beans.
Furthermore he wanted to sell me espresso with over 30% robusta and I told him that I liked the Arabica beans better for espresso. I know they mix some Robusta for better crema and taste and I don't have any problems with it, but that is at most 5 %.
I ended up buying two times 250 grams of coffee, since all the coffee shops in the area were closed (went there on a Monday).
The first blend I didn't like, it was a bit too acidic for me.
The second blend is not too bad, but not good either, no really specific taste.
So do yourself a favour and try other shops for buying coffee.