I was only transition through Dubai for less than 20 hours, so I just needed a hotel that is near the Airport (or at least can be accessed via Dubai's metro system from the Airport), not too expensive, but also comfortable. Suba Hotel does fit all the criteria: It was only about US$40 in June (which is off-peak season), near Al Rigga Metro station (which is only a few stops from the Airport), and it is quite clean and comfortable.
It is in a side street of a residential area. While its facade is quite ordinary, the rooms are actually nicer than I expected.
Wi Fi is included and works smooth here.
This neighborhood is not really interesting, and there are no real tourist sights nearby. However, from Al Rigga Station, you can take metro trains to many of Dubai's tourist sights.