Long story short: really terrible coffee.
Humble Lion's espresso is undrinkable. It is extremely bitter, acidic, and thin (almost no crema). It's so bad you can smell how sour it is before even putting it to your lips. A shameful amount of sugar was needed to make mine palatable. I don't know what the problem is, but I hope the owners read this and take note. It's also expensive at $3 a cup, but to be fair the amount served is more like a double than a ristretto.
The cafe has an otherwise pleasant ambiance but the music is played at bar volumes, which makes working, reading, and even having a conversation more difficult.