"apart-hotel" isn't really something that exists in the US. And I had no idea it was a searchable term in some online booking tools.
Somebody mentioned extended-stay hotels elsewhere as the closest analog in the US, but they tend to be focused on business travelers, and not always located in tourist areas. For example, there are a ton of extended-stay hotels near my office, but that's 30 miles outside Washington DC in the heart of the northern VA internet/tech zone (AWS, Google, the remnants of AOL, etc).
Edit - I'm looking at Hotels.com now, searching Inverness UK from the US site. "apart-hotel" is not an option under "Accommodation Type". Apartment is a distinct type from hotel, and it appears to be a mix of what you describe (bocks of apartments managed for vacation lets) and individual apartments (Airbnb-style).
Sometimes I stay at "apart'hotels" in Europe. At least at the chain I've used a number of times, it's really just a hotel with 1.) Some cooking facilities like an extended stay place in the US and 2.) Cleaning is just weekly. They also tend not to have features like bars and gyms that many hotels do. But, really, at least for my uses it's pretty much a hotel with a 24-hour front desk.
Somebody mentioned extended-stay hotels elsewhere as the closest analog in the US, but they tend to be focused on business travelers, and not always located in tourist areas. For example, there are a ton of extended-stay hotels near my office, but that's 30 miles outside Washington DC in the heart of the northern VA internet/tech zone (AWS, Google, the remnants of AOL, etc).
Edit - I'm looking at Hotels.com now, searching Inverness UK from the US site. "apart-hotel" is not an option under "Accommodation Type". Apartment is a distinct type from hotel, and it appears to be a mix of what you describe (bocks of apartments managed for vacation lets) and individual apartments (Airbnb-style).