Nice Vibe in Union Square Location
With so many choices of hotels in San Francisco, we recently decided to give Hotel Rex a try. Whenever we come to the city for business or pleasure, which is quite often, we usually opt for the Union Square area because of its central location.
When browsing for hotels online the Hotel Rex grabbed my attention for its library-themed details. From the photos the lobby/bar had a comfy "old-San Francisco" salon feel, with oil painting portraits hanging throughout. In person it didn't seem quite a lush as in the pictures, but it was charming nonetheless. 
We were traveling with a single cousin on this outing so we booked two rooms, one king and one double-bedded single. We definitely had a better room than she did. While our room was flooded with sunlight and spacious, hers was dark, decidedly smaller and dingier overall. Our air conditioner was also quiet while she complained that hers was noisy enough to keep her awake at night.
Every evening from 5-6 PM hotel guests are invited for happy hour, complimentary wine in the lobby bar. It was a nice way to unwind and segue from day to night. The staff were all friendly and accommodating, making out stay very enjoyable. 
Hotel Rex is not the most luxurious of San Francisco accommodations, but it is clean and comfortable, well priced, and is well situated in the heart of the city.