Please help with suggestions, need quickly, June 26th - 28th
What kind of room? Hotel, hostal, hostel? Single or double? Budget? Without knowing the answer to any of that, I will just say I checked and Hotel Jazz, which we liked a lot in April, has double rooms available for those dates for 135 euro. Hotel Praktik Rambla, very trendy, has doubles for 129,40. Both are very well located for enjoying Barcelona.
Bringing to the top for more suggestions for Bonnie.
Check tripadvisor.com. It gives you reviews as well as map locations of hotels to choose from. When you find one that looks like the right combination of price, location and amenities for you, you can book online. The site will transfer you to another site (e.g. booking.com, expedia.com, etc.) to complete the booking. I've used tripadvisor quite a few times and had only one small problem with an Expedia booking (question of whether breakfasts were included in the price) that was fixed quickly with Expedia's help.
We've stayed at L'Antic Espai twice and really like it. It's a small boutique hotel near Playa Cataluna. Safe, quiet, clean. About 120 euros for double rooms, 65 euros for singles. Great reviews on Trip Advisor. Very responsive owners, so if you email them, you'll hear back very quickly.