I had no first hand experience with using Eleven2 services, but from the looks of the feedback on WHT, I would think you will be satisfied with their services.
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Somewhere in the UK or Europe would probably offer the best response times for your clients located in Egypt. I suppose any East coast US location would be ok too. You can always use a CDN service like Cloudflare to bypass this if you're concerned about response times based on geographic location difference. We have many clients who are located in Australia but are hosted on our Canadian servers. Normally they would experience 150-200ms delay due to the difference of where they're located and where our servers are located but with Cloudflare it is no longer an issue for the majority of our Australian customers.
They offer good value for money, you can do your research on these forums by using the search function. Just remember you will always get some negative reviews about any company as someone else's experience may be different to yours.
What you also have to remember is people are more likely to cry wolf when something bad happens, rather then praising when something good happens.