This app was mentioned in 1 comment, with an average of 4.00 upvotes
No Uber - sorry - but if you stick the fona cab app on your phone (iOS also available) it will do the exact same job, except you'll need to pay cash.
What do you want from the city? Good food? Sights? Sounds? Beer? Culture? I can point you in a direction if I know what you are after...