If the location looks familiar that's because this is Edinburgh University's Adam House. Until 2019, this was a flagship venue and base during August for the Fringe group of theatre companies operating under the "C" umbrella.
The whole gamut of Fringe entertainment can be found here, from morning to late at night, in 20 performance spaces across 5 floors. Licensed cafe-bar.
The venue at the Fringe in 2019 became the Gilded Balloon Patter Hoose.