We stayed there few days in Feb 2012 and next time will go back. Located close to Asoka Skytrain station, very friendly and professional staff. Clean rooms, free wifi worked well, rooftop swimming pool was good. No bad things to say about this hotel!

Just completed a stay at this hotel. I would actually rate it a 4.5 out of 5. There are a lot of pluses;
- near the Asok BTS station and subway
- wonderful roof- top deck and pool
- excellent service
- top notch breakfasts
- great looking rooms with a lot of amenities such as safe, iron, blow- dryer, good lighting, rain shower.
- of course the incredibly comfortable beds
- free wi- fi
I really liked this hotel. Ken, who works there was particularly helpful and friendly. They also have a gym which is a great plus but it is very small. If you had 3 people in there it felt like you were tripping over each other. There are certainly cheaper options out there but they do not have everything this hotel offers. I found the pictures already posted by other travelers to be accurate of the property.
I would definitely stay here again.

The hotel was located on what appears to be a busy business district in Bangkok. For those who are travelling for leisure (rather than work), it might've been worthwhile selecting a hotel closer to Siam area.
With that in mind, Park Plaza was still conveniently located about 50m walk to Asoke station. We didn't get to check out the new shopping centre, Terminal 21, but from what we saw, it appeared pretty nice.
The hotel itself was quite comfortable, clean, and well priced. The service from the front desk staff was good, and always greeted you with a smile. Breakfast wasn't included in the price (Why?). But wasn't all that exciting anyway.
Overall... a nice hotel- but would probably try something else next time.

Overall, it was a good experience staying here as a business traveller. The room was neat, the bathroom was clean, the staff was kind and nice, the location was just 3-4 minutes walk from Asoke station when measured by my standard, free high-speed internet (Some other nearby hotel charged me as much as 500 baht a day, which was nearly 20% of the room fee.) and the rooftop pool had a good view.

One disappointment is that I chose "deluxe corner room" in order to have sunlight from the window but the sunlight was almost shut out by a nearby apartment. So I wonder what's the point choosing "deluxe corner room" and paying more.

Even the issue with deluxe corner room, i still think it was a good value.

Another small issue for me is that I just found out that I can't activate the Carlson membership the hotel staff gave me when I stayed there last time. The hotel staff must have registered my e-mail address incorrectly. It's not a big issue at all but I just think if I had a membership I would probably choose to stay there again for my business trips already planned for next month.