I booked this EXACT trip for myself and my girlfriend last november as a romantic getaway (most males are saying 'GAY' at their computer screens right now - I know!)
It may not seem like such a deal at first but look into it and you can see that the eurostar times are arriving in Paris at 10.17am and leaving Paris at 6.43pm. This means you get four FULL days there.
The price includes a discount of £50 as well as a free night which was originally £103.66. So in total its £153.66 off - which is pretty decent.
Now I know Paris isn't everyones favorite but I know some people will be looking for deals with partners so this is why i'm posting this.
The hotel Montcalm is a nice, small cosy hotel. I stayed there last time. It is a bit like the UK's version of Premier Inn. Easy access to the sights by metro. Cresta is a very good company to travel with as well.