Since the Melia Sitges is now fully booked, below are two hotels that are relatively close:
URH Sitges Playa Hotel (4 Star) – 10 min walk to the Melia
Hotel Port Sitges (4 Star) – 10 min walk to the Melia
There are also many other options you can find on-line. Sitges is a tourist town with many small hotels that are only minutes walk or a short taxi ride to the Melia Sitges. For example, if you go to BOOKING.COM you can find many attractive choices – all located only a short distance from the Congress venue.