Yay got most of our accommodation booked in at lunch time today! All pics from the interwebs...
For DH and his parents, I have booked superior rooms at the rather unassuming looking Hotel 81 Osaka in Singapore.

The standard room wasn't available, but I think it will be nicer for them this way anyway - at least they'll get windows in their rooms lol! DH liked this one because (aside from being under budget) it's quite close to the hotel we've stayed at previously, so he'll be confident finding his way around the area. It's just a short walk from Outram Park Station (which connects directly to the airport), and there's a great food court not far away.
In Ho Chi Minh City, I have booked 2 standard rooms at the Duc Vuong Hotel, and one superior (availability again). The superior seems to be slightly larger with a window and an extra single bed.

We won't be at this place for long, but it seems to be in the middle of town, close to a few attractions if that's what people decide they want to do. The selling feature for me was the great rooftop bar (love a rooftop bar at a hotel in Asia!).
In Hoi An, we chose to stay at the Vinh Hung Emerald Resort again (DH and I stayed there on a previous trip). I have booked 3 deluxe rooms (their most basic room type).

Absolutely loved this place last time we stayed there! It's on a island in the river, so it's far enough away from the hustle and bustle to be nice, but close enough to be convenient. Hopefully this time around we'll have enough time to enjoy some of the features like the pool and complimentary river cruise. SIL and her DH may enjoy the free shuttle to the beach. I mentioned that it was a surprise trip to celebrate an anniversary, and said that anything they could do to make the trip extra special for MIL and FIL would be much appreciated, and I've already got an email from them confirming that they will make special arrangements!
In Dong Ha, I've booked 3 deluxe rooms (their most basic room type) at the Muong Thanh Quang Tri Hotel. This seems to be quite a big hotel chain in Vietnam, and this is one of their newest offerings.


It looks lovely and luxurious, and was absolutely dirt cheap (because they don't get many tourists staying overnight in the area).
Finally, for DH and I, and MIL and FIL, I've booked 2 traditional bamboo bungalows at Nguyen Shack in Ninh Binh.


While this (believe it or not) was the most expensive accommodation on the Vietnam section of the itinerary at $76 per night, these little shacks looks amazing with all the mod-cons including ensuite bathrooms with hot showers, wifi and mini fridges (and all the traditional charm of the bamboo construction and balcony hammocks). The only thing they don't have (which is why I didn't book one for SIL) is air-con.
Glad to have the majority of accommodation locked in now and know that we can all stay together at the same places without having to get too carried away with premium room types!