We track 507 hotels in Barcelona; 26 of them are listed here. The rest either have a different setup or we have not yet established one, so check the hotel itself before you rely on it.
If the machine is OriginalLine, bring whichever compatible capsules you like — or a refillable capsule and your own ground coffee.
If it is Vertuo, only genuine Vertuo capsules work. Buy them before you travel if your destination has no Nespresso boutique.
If you do not know which line, wait until you see the machine. Vertuo capsules are round and domed; Original capsules are small and cone-shaped.