I stayed at Hilton Union Square for 5 nights in July. I paid in advance and reserved their basic room. I was completely satisfied with everything. The staff was friendly, bed was comfy, and the room was cleaned perfectly. Good TV, comfy ergonomic desk chair and lots of bathroom supplies. Free wifi in the lobby which was good enough for me. No complaints about noise etc. like another traveller mentioned. Everything I expect from Hilton and that's why I like staying with that brand. The place took a little bit of time to get used to though because there are 3 towers and many entrances etc. Various rental car agencies right across the street. It was also perfectly located near Union Square and various public transit options. I would suggest however not buying from Starbucks in the lobby - they charge a full dollar more for a coffee than the Starbucks 1 block away (towards Union Square).
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