I was in the Strip on my lunch break walk, and tweeted a quick question - "where is The Best cup of coffee around here?" the responses overwhelmingly led me to 21st St Coffee.
Expecting to be disappointed, as is often the case with over-hyped places, I was proven otherwise. I knew I wanted black coffee, and was really excited when the barista offered to explain what my choices were. You guys, he actually knew what he was talking about. Very descriptive and approachable, which made me really excited to try the Peruvian blend that promised notes of chocolate and dried fruit. They drip your cup as you order, which no doubt adds so much to the taste. They take their coffee seriously.
Bottom line ...
Friendly: absolutely
Delicious: absolutely
Pricey: my small cup was $3.50. But, you get what you pay for.
Comfy: Eh. I wish it were a better space for lounging. Skinny counter with four seats, and two tiny tables in the window.