Before lockdown, I would do a fair amount of travelling for work.
If I'm travelling by public transport, the most important feature for me is the location.
Check the precise location of the hotel and don't rely on the name. The "Marriott Oxford South"
https://www.marriott.com/hotels/travel/oxfcx-courtyard-oxford-south is 11 miles from Oxford!
If you are going to use public transport to get to the hotel, check that it runs at the times that you will need to use it.
http://www.wikivoyage.org is good if you need background information about a place. For example its good for advice on how to transfer from an airport to a city. wikitravel.org has similar information but has adverts.
https://en.wikivoyage.org/wiki/Wikivoyage:Wikivoyage_and_Wikitravel has more on the differences
Its worth reading reviews for a hotel at sites like
www.tripadvisor.com Treat them with a bit of caution. Some reviews are fake. Others are from people who slag off a hotel for things that you might not care about.
I stayed in one horrible Travelodge, which had a mixture of good and bad reviews. There might have been some nice rooms, but the one I had was dank, mouldy and right next to a busy road. I left a window open for ventilation, woke up at 5am when a lorry passed by, and then left.
What features do you want in a room? Refurbished rooms will have more power sockets and better air conditioning.
Check for cashback from a site like
www.quidco.com and
www.topcashback.co.uk Booking sites like
www.expedia.com www.ebookers.com www.hotels.com and
www.booking.com often list the same price that you would get from the hotel's own WWW site.
Often you can get 10% cash back from Quidco as well as extra bonus.
www.trivago.com checks these sites for you, but it will take any click-through revenue that you could have got from a cashback site.
Sometimes a hotel will be fully booked from those sites, but still be available through the hotel's own site. This has happened for me with a Novotel which was only available for the nights I wanted through their own
www.accor.com site
Holiday Inn Express includes a free breakfast. Holiday Inns charge a load extra. Don't pay extra for a room with breakfast included in the room rate, if you need to leave at 5.30am before its served.
I like using
www.tripit.com to put together an itinerary. For the common airlines, hotel and train companies, you can forward the conformation email and it will pick out the details for your stay. It really helps to do this, to make sure that you book all the things for a trip in the right order. Then you can print out a PDF of the trip, or access it in their app. This makes it easier to enter the address of a hotel into Google Maps, and saves you from getting directions to the wrong hotel.
One grumble with the tripit WWW site used to be that it sometimes assumed that the time zone is in California, unless you finish every address with "UK".