What you offer is mostly up to you! All you need to do is photograph it, and be as accurate as you can with your listing. It can be hard when you start out as you will have no reviews, so best to keep prices low to start with then once you have had a few guests (and some feedback/star ratings) you can put up your prices in line with the rest of your neighbourhood.
And it would be a really good idea to check what is on offer in your neighbourhood already, in order to get a realistic idea of what hosts offer, and how much it costs.
I have a period townhouse and am fairly close to very popular tourist attractions. The downside is we are a busy (and slightly messy) family with a toddler and so the two rooms are self contained as much as possible (seating as well as sleeping areas) and then we have two bathrooms which they use too. And self service breakfast is laid out in the kitchen diner in the mornings.
I've developed a modular pricing system rather than a flat one, so there's a basic price for one person, then additional charges for each extra person, then it's slightly more at weekends too.
Biggest challenges have been getting the house turned around quickly (so a triple occupancy on the top floor of the house involves 6 towels, two sets of bed linen, hoovering, cleaning two bathrooms, hoovering all halls and stairs and cleaning the kitchen). And of course a lot of people stay only one night so it's a bit of an endurance at times (you can have a minimum stay of > 1 night but I allow them as needed the bookings).
Most people turn up when they say they're going to, but a handful of guests have turned up 3/4 hours late, which is infuriating (especially if it's 1am and you're sat by the door so that DD isn't woken by the door going).
I've also found it quite stressful being 'scored' by each guest. Reviews are good, but it's really galling when you've bent over backwards for people and then they're a bit moany when they write a review. I sometimes think the more you offer guests, the more they have to complain about...
So, basically keep it clean, keep it simple, be upfront about what you can and can't offer (perfectly ok not to offer breakfast for example) and play to your strengths (local landmarks, views from the room, etc).
Phew - that was a bit long! Hope it helps though
I could possibly write a book about the things my guests have got up to but that's another thread