Must admit I hadnt’ been to the Bree Louise til relatively recently and the beer was pretty decent – and a good choice.
A few craft beer alternatives to the Euston Tap – Holborn Whippet, just around the corner from Holborn tube, Craft Beer company, about 5 mins north of Chancery Lane tube (tho’ rather IPA-heavy on the handpulls last time I was there).
Princess Louise is a nice Sam Smiths boozer with lots of tilework and reinstated wood/glass petitions – again, near Holborn tube.
Market Porter opposite Borough Market always has a good choice of beer, tho’ a bit further from Euston.
Re Harp – great pub, tends to get particularly busy just before/after theatre show times, so worth trying to time yerself accordingly.
Nicholsons pubs are pretty decent – sausage/mash/pie kinda stuff tho’ is seems to vary between pubs
http://www.nicholsonspubs.co.uk/
– probably had the best pub pie I’ve ever had in their Dog&Duck in Soho a year or two ago (but they could have changed the menu)
http://www.nicholsonspubs.co.uk/thedogandducksoholondon/
The Royal Oak, nearish Borough Tube is a bit further still, is Harveys, and certainly used to do outstanding grub (inc proper steak+kidney puddings) – I haven’t been there for a few years tho’
http://www.harveys.org.uk/pubs-tenancies/find-our-beer/the-royal-oak-london
http://www.timeout.com/london/bars-and-pubs/royal-oak
Oh, and the Clachan nr Liberty, and nearby Youngs’ Windmill, just off Regents St are pretty decent – latter certainly does food:
http://www.windmillmayfair.co.uk/