The tough part about corridor coverage is that the rooms near the AP will get good or have okay coverage, but other rooms further away will not. Placement of access points are the key to a good wifi, not just adding more AP's to the network. Site survey is always and important step in a good wifi experience none the least. Having said that, adding repeater or signal boosters, will increase the signal to room possible, but the signal will not be very useful. There is a saying, "It's like a father and some throwing a football, the father can throw it to the son, but the son may not be able to throw it back to the father." Using high gain and or boosters, the AP can send its signal out, but the signal from the client might not ever get back.
Cisco has the 700w, that would work well in your environment, but you would need a WLC. This can maybe be placed in every other room, if you have enough in your budget.
You need to weigh in cost and what you want to provide to your customers. I don't like the WAP121's to be honest and prefer in mid to enterprise customers, they use the higher end Cisco wireless technology.
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Special thanks to Alex McDonald for sharing his favorite tip:My favorite
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