Went to BKK on 28 June for 5 days and stayed at Grand Diamond Plaza Suites hotel. For the location and the fact that every room is a suite (bedroom + sitting room + 2 TVs), it is good value. The breakfast buffet is very good - I had fresh coconut and fruit juices every morning! plus bacon, kway teow tng, dim sum etc..

Just next to the hotel, on the right is the Platinum Mall and across the overhead bridge is the Pratunam shopping area. Foodstalls and restaurants are everywhere around. When we wanted to go further, there are so many taxis passing by Petchburi Rd in front of the hotel.

For RM220+ a night, I was very satisfied with my stay.

Don't know what "affordable" means to you, but I enjoyed staying at Grand Diamond Plaza suites Hotel which is just on the left of Platinum Mall. Then to the right of Platinum Mall (in fact linked to the Mall) is the new Novotel. For a much cheaper option, around 300 metres across the overhead bridge from Platinum Mall is the First House Hotel. I stayed there twice and it is a very decent place for around RM100/room night. Once you step out of First House, it is already the Pratunam street market!