I was looking for a nice, quaint coffee shop with free wifi and comfortable seating. The pictures I saw on Yelp pointed me to Perk Up Coffee Shop. I'm writing this review during my first visit in the middle of a Saturday, so my experience may not be representative of a more regular customer.
I showed up around 1130 in the morning and the place was empty. The staff was very friendly and greeted me upon entry. I got oatmeal and black coffee. The oatmeal was delicious, but the coffee was a little watered down. That may have been due to the odd time of day, but that's the main reason I'm docking the place one star. The other reason being that, while I enjoy the decor and overall feel of the place, there aren't enough large tables. There's one 6-person table, but the small tables could be just a little bit larger. Can't really spread out for studying/working purposes very easily.
Otherwise, I think Perk Up Coffee Shop is a great little place on the Southwest side. I'll definitely be back.