I have traveled to Barcelona over 10 times, and stayed at different hotels. Since 2018, AC Hotel by Marriott Diagonal L"Illa became my home in Barcelona. If you look at its location and facilities, this is no doubt a business hotel. However, its location is very convenient, you can get to any tourist attractions within 10-15 mins of taxi. The staff at reception are very welcoming and accommodating, during my stay they helped to arrange a taxi for me during rush hour. Furthermore, it is next to the Diagonal L"Illa shopping mall with food courts, restaurants, and supermarket. The rooms are spotless and in good size.
This is my 2nd stay in this hotel and I will definitely return very soon!

First of all the hotel has a lot of potential - it’s a lovely clean and well located hotel. We got upgraded to a family room but when we also needed a cot which it seems the hotel does not have (!). They also don’t have tissue boxes believe it or not - tissues are 5 to a small pack relegated to the bathroom. Which is not helpful when you need tissues. The small bottles of Hair Conditioner not given or available. The toiletries in general, as well as the number of staff, gave the hotel the lower stars.

There was never anyone at the front desk, and we would have to call a person from the inside office where he was hanging out in order to get anything, including check-in. The front desk (particularly the PM gentleman) was so unhelpful and actually cost us a lot because of his lack of advice on parking. When we first reserved the hotel we mentioned we were driving and would need parking. They told us there is parking in the mall w a special rate, and that the hotel is easy to find from the parking. That is all untrue, sadly and we were left to fend for ourselves despite asking for help and advice when we arrived. When we called again they assured us of the same. In reality when it came time to pay for parking he didn’t give us anything like stamp or coupon and when we paid parking it was over 60E! This is for less than 24 hours, The helpful parking office then told us there is a multiple day pass for far far less.
Front desk should hve told us this information when we asked about parking.
The skint behavior also was reflected in the room service - there is only an available service of going to the 2nd floor, seeing the menu there (which could have been sent to us via WhatsApp or email saving us a trip after 6 hours in the car) , then going and picking up the food when it was ready! This is also due to a lack of staff training or number. The hotel has a lot of potential but without such small essential factors like a helpful front reception staff and adequate toiletries and room service staff it fell far below what it promised.