This building is part of the Kishu An Forest of Literature in Taipei. It’s a space where literature lovers can hang out, drink coffee, meet authors, and participate in literature-related events. It’s located on Tongan Street down by the river. Take exit 2 out of Guting MRT station and then walk down Tongan Street to nearly the very end.
According to what I’ve read online, the building was originally a Japanese-styled restaurant built in 1917. It then served as a dormitory for a while. There appeared to be a second building being restored when I went to visit, so the space might expand in the near future. You can find out about events at this space at their website.