I've stayed in all the UK ones except Cardiff and Leicester Square. The best service I have had was in Liverpool, however property wise the two I particularly like are Durham and the new property in Dundee. Both buildings are really nice and suit the brand.

The only Indigo I have stayed at outside of the UK was Madrid and we really liked it.

I really like the brand, however the big issue I have with Indigo is I don't really think large properties with 130+ rooms are "Boutique" and as such the larger properties don't have the same character as the smaller ones.