My first residence when newly arrived all those years ago, was also in Tat Che Ave, in one of the tri level Village Garden residences... I really enjoyed being 5 minutes walk from the mall/MTR back then, and that it's largely level ground around there lol. Walking to Mong Kok, say the Argyle centre, took about 15 minutes, so it was pretty handy if you worked in inner Kowloon. Most expats hang out at the Festival Walk Shopping complex, namely Starbucks and PCC. A lot of expat school teachers live in the neighbouring area as, Kowloon Tong sports a large concentration of the international schools..
Regarding Sai Kung, another area that we have lived, and adored, one of the reasons that I suggested Hebe Haven, especially Marina Cove toward the large round about, is that its a very quick/fast direct route to Hang Hau MTR from there. It bypasses the basket case of Hirams Highway between the Esso Service station in Sai Kung town and Hebe Haven Yacht Club...After that you're sweet..
Compare it to Tai Wan Village on the other side of Sai Kung Town, living in Hebe Haven/Marina Cove, reduces your commute time to 30 - 35mins to TST.
I agree though, if you choose the wrong section of road in the Sai Kung District, it will cost you dearly in time loss.