Mansion 51 looks like an apartment/condo building with unrented/unsold units being offered as hotel rooms. The room we had had 2 separate bedrooms and 2 full bathrooms. The kitchenette was decent with a full sized fridge, but there were hardly any cooking utensils or pots/pans. There were very few cups/glasses and silverware. The rooftop infinity pool was great. We never saw anyone up there while we were up there every evening. The view from the pool was nice. There are a couple of decent restaurants nearby and a decent sized convenience store a block away. The unit was clearly lived in previously with a less-than-professional job of drywall repair and painting. But, overall, I would definitely stay here again. The AC worked very well. The unit was spacious. We didn't use the stove, TV, or dining table, but we did relax on the L-shaped couch. The staff is friendly and helpful. The view from our room was of an empty lot that used to have some type of building on it.
The WiFi isn't the greatest, but I didn't expect blazing speeds while in SE Asia. You are given a code specific to your room, but I found connecting to different room's WiFi in different parts of the apartment works even better.
While Mansion 51 isn't in the heart of the tourist attractions, it's a pretty quick tuk-tuk ride to get there. Sambat (aka Richard), a tuk-tuk/taxi driver, is always waiting outside. He's very polite, professional, and we found him to be a great value. We used him for 3 days.