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Binary black holes (BBHs) are one of the endpoints of isolated binaryevolution, and their mergers a leading channel for gravitational wave events.Here, using the evolutionary code \textsc{StarTrack}, we study the statisticalproperties of the BBH population from isolated binary evolution for a range ofprogenitor star metallicities and BH natal kicks. We compute the mass functionand the distribution of the primary BH spin $a$ as a result of mass accretionduring the binary evolution, and find that this is not an efficient process tospin up BHs, producing an increase by at most $a\sim$~0.2--0.3 for very lownatal BH spins. We further compute the distribution of merger sites within thehost galaxy, after tracking the motion of the binaries in the potentials of amassive spiral, a massive elliptical, and a dwarf galaxy. We find that afraction of 70-90\% of mergers in massive galaxies and of 40-60\% in dwarfs(range mostly sensitive to the natal kicks) is expected to occur inside oftheir hosts.  The number density distribution at the merger sites further allows us toestimate the broadband luminosity distribution that BBH mergers would produce,\textit{if} associated with a kinetic energy release in an outflow, {which, asa reference, we assume at the level inferred for the \textit{Fermi} GBMcounterpart to GW150914, with the understanding that current limits from the O1and O2 runs would require such emission to be produced within a jet of angularsize within $\lesssim 50^\circ$.}

Binary Black Hole Mergers within the LIGO Horizon: Statistical Properties and prospects for detecting Electromagnetic Counterparts