it needs to be right for YOU. i think in most cases, rabbits benefit from having a friend, esp. if their human cannot spend a lot of time with them. if you had to travel, that would provide some stability for your bunny if he had a mate (but possibly double pet-sitting costs). i have found that a second bunny has calmed down my first (not totally) but to a noticeable degree. and it’s pretty much proven that two are easier than one b/c they cause less trouble, are less mischievous, and not as bored.
i don’t think your place being small should be a huge factor once they’re bonded, but you need to keep in mind that during the bonding process you need a separate cage set-up and this might be for a week, or it might be for a few months. however long it takes. i bonded an hour a day for 3 weeks straight to get my two together, so it does require a consistent time commitment.
i have noticed an increase in cost. others say they have not, but i’ve noticed. i go thru double litter b/c we have two pen litterboxes, double hay, more than twice the amount of veggies a month. we get nail trims at the vet every month. to be on the safe side, you need to calculate what you spend in a month ON ONE and if you can afford to spend double what you are doing now. this is not counting an emergency vet situation either… if you cannot do double, i would seriously evaluate if it’s the right time to add a second bun… it might not be good now, but you can always get another in the future when things are better for you.
also keep in mind the set-up cost. you need a second cage, litterbox, food/water dish, toys, etc. plus the cost of the adoption fee. you might end up spending 200 bucks just to get the bunny home. maybe try to save some money each month with the goal of getting a second in 6 months?