For anyohne looking for information about the hotels
DCL is using in Barcelona, here's what we've learned.
Renaissance Barcelona (was AC Diplomatic (Marriott)) DCL IS USING THIS ONE. PARTY OF 4 IS $408/NIGHT (2 ROOMS)
Hilton Diagonal Mar DCL IS USING THIS ONE. PARTY OF 4 IS $416/NIGHT (2 ROOMS)
We went ahead and added two nights pre-cruise and one night post-cruise at the Renaissance Barcelona through DCL. You can cancel for a full refund as long as it is more than 14 days prior to your stay. We added it while we could get it. I compared the price with what these hotels are currently booking at and the DCL rate is fair per room per night. When our TA first emailed me the price for a night, I thought it was per-room and that we'd have to still get two rooms - no thank you! But for two rooms, this is in the range of what we've paid for one room pre-cruise in both London and Vancouver through DCL (and stayed at really nice hotels).
Just thought I'd pass along the information in case someone else was waiting to find out.