We have not personally met with Smith during our stay there as we were out most of the time but nevertheless the staff was excellent! We had a bit of an issue going there with the language barrier etc but we managed to find the place. Soon after we got their card with the address printed in Thai and it's been a no issue from then on.
The apartment was situated in a quiet residential area, mainly for Japanese expats as evident from all shops nearby. It's within walking distance to Sukhumvit Rd probably 10-15 minutes. Cab should cost you only 40 bhat to BTS Station Asok.
Having stayed in Singapore before coming to Bangkok, it was such a pleasant surprise to able to snag something of this price range and be given the kind of space and amenities that we were able to get. Place is clean, spacious, great view, awesome facilities( the pool on the 30th floor is gorgeous!), nearby mall & eateries and a 7/11 downstairs. Basically all that you need is within easy reach here.
Can't recommend the place highly enough and I've been planning on staying here again the next time I visit Bangkok. Truly the best place we've stayed.