The main city is an island, with 3 bridges leading to it (suppose 4 if you count the one from saadiyat island) from the mainland. Areas like al Raha beach andn Khalifa city are on the main land, therefore off island. The majority of the newer complexes are off island.
Etihad towers as featured in fast and the furious if you want a nosey is very nice - a friend lived there - but you get no balconies so no private outdoor space. The pool is nice, and you've got a hotel in the complex for nipping for a drink. When my friend lived there, it was mostly singles and very few families. Her flat was small though, a 2 bed was about 1350sqft. I don't know if the bigger ones are similarly undersized. Ideal location if working in that area.
Nation towers and capital plaza are also good on the corniche. Capital
Plaza in particular has massive flats (same friend's 2 bed in there was 2,500sqft - I know you're not after a 2 bed but just as an idea!). Some of the older corniche buildings are nice too, cracking views over the beach.
Also have a look at saadiyat island - st Regis apartments and saadiyat beach residences - if your DH is looking corniche area, this is maybe 10mins away.
Be careful looking around some of the olde buildings in the city centre though - there's no car parking and colleagues of mine have resorted to selling their cars and getting taxis to work. One guys building in particular was that busy he often had a 20
Min walk from where he could find parking to his building.
Marasy at al Bayern wharf may work too, as might eastern mangroves.
On his next call he should find out more about schooling. A friend gets 18k allowance, another friend 23k, mines 43k and DHs is unlimited, so very big scope.
For housing though I'd be looking at
Schools first. Cranleigh, for example, is on saadiyat and would be 20-25 mins from Raha beach and Yasmina is in kca and 10 mins from Raha beach. Corniche area would mean lots of travel to the British schools (apart from cranleigh)