You can find the bar on the first floor of the house on the corner of Suur-Karja and Pärnu mnt. It is a very open and bright place (as opposed to dark, narrow and smoky), yet quite cosy. Nice features are the very big central bar and the giant TV screen on which videoclips are projected. This place is very new, but it's bound to become a popular weekend hangout.
McCools offers your normal range of drinks as well as food and cocktails. Prices are normal for Tallinn. I read somewhere that on Friday and Saturday nights prices of some drinks fluctuate according to demand, but I can't confirm this from experience. Should be fun though :-)