Well considering this place is awash with students, cant imagine you could go to ANY of the pubs and not find lots of them. You've got South Bank University for a start, the London College of Printing, and yourselves (Guys and Thomas's). If you look back a few strings you will find a BIG discussion about which pubs are best (tremendous partisanship everyone rooting for his own.) I'm not really clever about pubs, but have been introduced via this website to the Royal Oak in Tabard St. which was LOVELY. But I dare say after a couple of weeks your fellow students will sort you out!!
The nearest the area has got to a Boho boozer is The Rose behind Guy's, junction of Weston St and Snowsfields. Cracking dukebox, candles and, ahem, friendly when it gets late. Watch out for the chessplayers, they get a bit rowdy on Monday nights.