Since the sofa that you have chosen is ivory and the concrete patio is gray concrete, I would use this opportunity to add some color. I would do the ivory for both the chairs and the sofa, and add colorful pillows and perhaps a patterned rug. You don't say what else is in the yard: is there grass, planters, flowers, pool? Neutral furniture, neutral rug, neutral pillows, all on a gray concrete slab seems pretty washed out to me, but if you have greenery and colorful flowers, it might work. Need more information. I like the sofa and chairs, though the stripe is not my personal taste, which, of course, doesn't matter at all!